diff --git a/doc/index.html b/doc/index.html
index c993651..069a2ac 100644
--- a/doc/index.html
+++ b/doc/index.html
@@ -527,6 +527,7 @@ data-styled.g140[id="sc-global-kJtbWf1"]{content:"sc-global-kJtbWf1,"}/*!sc*/
 </div></div></div></td></tr><tr><td class="sc-fzqBZW sc-fzoyAV ewSDWh" kind="field" title="htmlurl"><span class="sc-fzoXzr jYkWkg"></span>htmlurl</td><td class="sc-fzoLag fNYEXC"><div><div><span class="sc-fzqzlV sc-fzqLLg ghLFqa"></span><span class="sc-fzqzlV sc-fzoxnE iMySHJ">string</span></div> <div><div class="sc-fzoant sc-fzoYHE eTVXpd"><p>String containing the URL to a file containing the HTML content of the email. Ignored (but still validated) if <code>html</code> if provided. If both <code>htmlurl</code> and <code>text</code> or <code>texturl</code> are provided, will create a multi-part MIME message.</p>
 </div></div></div></td></tr><tr><td class="sc-fzqBZW sc-fzoyAV ewSDWh" kind="field" title="text"><span class="sc-fzoXzr jYkWkg"></span>text</td><td class="sc-fzoLag fNYEXC"><div><div><span class="sc-fzqzlV sc-fzqLLg ghLFqa"></span><span class="sc-fzqzlV sc-fzoxnE iMySHJ">string</span></div> <div><div class="sc-fzoant sc-fzoYHE eTVXpd"><p>String containing the plain text content of the email. Takes precedence over <code>texturl</code> if provided. If both <code>text</code> and <code>html</code> or <code>htmlurl</code> are provided, will create a multi-part MIME message.</p>
 </div></div></div></td></tr><tr><td class="sc-fzqBZW sc-fzoyAV ewSDWh" kind="field" title="texturl"><span class="sc-fzoXzr jYkWkg"></span>texturl</td><td class="sc-fzoLag fNYEXC"><div><div><span class="sc-fzqzlV sc-fzqLLg ghLFqa"></span><span class="sc-fzqzlV sc-fzoxnE iMySHJ">string</span></div> <div><div class="sc-fzoant sc-fzoYHE eTVXpd"><p>String containing the URL to a file containing the plain text content of the email. Ignored (but still validated) if <code>text</code> is provided. If both <code>texturl</code> and <code>html</code> or <code>htmlurl</code> are provided, will create a multi-part MIME message.</p>
+</div></div></div></td></tr><tr><td class="sc-fzqBZW sc-fzoyAV sc-fzokvW ilQYAU" kind="field" title="sender"><span class="sc-fzoXzr jYkWkg"></span><button aria-label="expand properties">sender<svg class="sc-fznKkj czpFYH" version="1.1" viewBox="0 0 24 24" x="0" xmlns="http://www.w3.org/2000/svg" y="0" aria-hidden="true"><polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "></polygon></svg></button></td><td class="sc-fzoLag fNYEXC"><div><div><span class="sc-fzqzlV sc-fzqLLg ghLFqa"></span><span class="sc-fzqzlV sc-fzoxnE iMySHJ">object</span></div> <div><div class="sc-fzoant sc-fzoYHE eTVXpd"><p><code>Recipient</code> object to be used as &quot;From:&quot; address for the email</p>
 </div></div></div></td></tr><tr><td class="sc-fzqBZW sc-fzoyAV sc-fzokvW ilQYAU" kind="field" title="recipients"><span class="sc-fzoXzr jYkWkg"></span><button aria-label="expand properties">recipients<svg class="sc-fznKkj czpFYH" version="1.1" viewBox="0 0 24 24" x="0" xmlns="http://www.w3.org/2000/svg" y="0" aria-hidden="true"><polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "></polygon></svg></button><div class="sc-fzoWqW sc-fzplgP chnCRo"> required </div></td><td class="sc-fzoLag fNYEXC"><div><div><span class="sc-fzqzlV sc-fzqLLg ghLFqa">Array of </span><span class="sc-fzqzlV sc-fzoxnE iMySHJ">objects</span><span class="sc-fzqzlV sc-fzoMdx klHALA"> (<!-- -->Recipient<!-- -->) </span></div> <div><div class="sc-fzoant sc-fzoYHE eTVXpd"><p>Array of <code>Recipient</code> objects to be used as &quot;To:&quot; addresses for the email</p>
 </div></div></div></td></tr><tr><td class="sc-fzqBZW sc-fzoyAV sc-fzokvW ilQYAU" kind="field" title="ccs"><span class="sc-fzoXzr jYkWkg"></span><button aria-label="expand properties">ccs<svg class="sc-fznKkj czpFYH" version="1.1" viewBox="0 0 24 24" x="0" xmlns="http://www.w3.org/2000/svg" y="0" aria-hidden="true"><polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "></polygon></svg></button></td><td class="sc-fzoLag fNYEXC"><div><div><span class="sc-fzqzlV sc-fzqLLg ghLFqa">Array of </span><span class="sc-fzqzlV sc-fzoxnE iMySHJ">objects</span><span class="sc-fzqzlV sc-fzoMdx klHALA"> (<!-- -->Recipient<!-- -->) </span></div> <div><div class="sc-fzoant sc-fzoYHE eTVXpd"><p>Array of <code>Recipient</code> objects to be used as &quot;CC:&quot; addresses for the email</p>
 </div></div></div></td></tr><tr><td class="sc-fzqBZW sc-fzoyAV sc-fzokvW ilQYAU" kind="field" title="bccs"><span class="sc-fzoXzr jYkWkg"></span><button aria-label="expand properties">bccs<svg class="sc-fznKkj czpFYH" version="1.1" viewBox="0 0 24 24" x="0" xmlns="http://www.w3.org/2000/svg" y="0" aria-hidden="true"><polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "></polygon></svg></button></td><td class="sc-fzoLag fNYEXC"><div><div><span class="sc-fzqzlV sc-fzqLLg ghLFqa">Array of </span><span class="sc-fzqzlV sc-fzoxnE iMySHJ">objects</span><span class="sc-fzqzlV sc-fzoMdx klHALA"> (<!-- -->Recipient<!-- -->) </span></div> <div><div class="sc-fzoant sc-fzoYHE eTVXpd"><p>Array of <code>Recipient</code> objects to be used as &quot;BCC:&quot; addresses for the email</p>
@@ -534,9 +535,9 @@ data-styled.g140[id="sc-global-kJtbWf1"]{content:"sc-global-kJtbWf1,"}/*!sc*/
 </div></div></div></td></tr><tr><td class="sc-fzqBZW sc-fzoyAV sc-fzokvW ilQYAU" kind="field" title="placeholders"><span class="sc-fzoXzr jYkWkg"></span><button aria-label="expand properties">placeholders<svg class="sc-fznKkj czpFYH" version="1.1" viewBox="0 0 24 24" x="0" xmlns="http://www.w3.org/2000/svg" y="0" aria-hidden="true"><polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "></polygon></svg></button></td><td class="sc-fzoLag fNYEXC"><div><div><span class="sc-fzqzlV sc-fzqLLg ghLFqa">Array of </span><span class="sc-fzqzlV sc-fzoxnE iMySHJ">objects</span><span class="sc-fzqzlV sc-fzoMdx klHALA"> (<!-- -->Placeholder<!-- -->) </span></div> <div><div class="sc-fzoant sc-fzoYHE eTVXpd"><p>Array of <code>Placeholder</code> objects. Any occurrences of <code>{PLACEHOLDER_NAME}</code> (<code>name</code> in all caps enclosed with curly brackets) in the email&#39;s HTML or plain text will be replaced by <code>value</code>.</p>
 </div></div></div></td></tr><tr class="last undefined"><td class="sc-fzqBZW sc-fzoyAV ewSDWh" kind="field" title="key"><span class="sc-fzoXzr jYkWkg"></span>key<div class="sc-fzoWqW sc-fzplgP chnCRo"> required </div></td><td class="sc-fzoLag fNYEXC"><div><div><span class="sc-fzqzlV sc-fzqLLg ghLFqa"></span><span class="sc-fzqzlV sc-fzoxnE iMySHJ">string</span></div> <div><div class="sc-fzoant sc-fzoYHE eTVXpd"><p>API key to authenticate request with</p>
 </div></div></div></td></tr></tbody></table><div><h3 class="sc-pbIaG kfpsaT">Responses</h3><div><button class="sc-pJurq eyfSne"><svg class="sc-fznKkj fscamO" version="1.1" viewBox="0 0 24 24" x="0" xmlns="http://www.w3.org/2000/svg" y="0" aria-hidden="true"><polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "></polygon></svg><strong>200<!-- --> </strong><span class="sc-fzpkqZ ebKPJY"><p>The request was received and processed.</p>
-</span></button></div></div></div><div class="sc-AxgMl sc-AxheI hkIgFQ"><div class="sc-oTbqq fJLoZr"><button class="sc-pjSSY ewatGX"><span type="post" class="sc-prOVx hObpXE http-verb post">post</span><span class="sc-paXsP bhaFYt">/sender.php</span><svg class="sc-fznKkj ejwrda" style="margin-right:-25px" version="1.1" viewBox="0 0 24 24" x="0" xmlns="http://www.w3.org/2000/svg" y="0" aria-hidden="true"><polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "></polygon></svg></button><div aria-hidden="true" class="sc-qQmou laHEoQ"><div class="sc-qYiqT kPAzCv"><div class="sc-fzoant sc-fzoYHE eTVXpd"></div><div tabindex="0" role="button"><div class="sc-pAZqv cGlHkj"><span>https://expmail.kumi.live</span>/sender.php</div></div></div></div></div><div><h3 class="sc-fzpans lerNRm"> Request samples </h3><div class="sc-fznzOf jLdbSQ" data-tabs="true"><ul class="react-tabs__tab-list" role="tablist"><li class="react-tabs__tab react-tabs__tab--selected" role="tab" id="react-tabs-0" aria-selected="true" aria-disabled="false" aria-controls="react-tabs-1" tabindex="0">Payload</li></ul><div class="react-tabs__tab-panel react-tabs__tab-panel--selected" role="tabpanel" id="react-tabs-1" aria-labelledby="react-tabs-0"><div><div class="sc-fzpisO dBHtDj"><span class="sc-fzoVTD kNWQuy">Content type</span><div class="sc-fzoJus ixzWHz">application/json</div></div><div class="sc-fznXWL iZtsQe"><div class="sc-fzqMdD cDvkPr"><div class="sc-fzomME ldXyaM"><button><div class="sc-fznAgC jKdGWZ">Copy</div></button><button> Expand all </button><button> Collapse all </button></div><div class="sc-fzoant gGXDRA sc-fzowVh iKXZfK"><div class="redoc-json"><code><div class="collapser"></div><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable "><span class="property token string">"subject"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"html"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"htmlurl"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"text"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"texturl"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"recipients"</span>: <div class="collapser"></div><span class="token punctuation">[</span><span class="ellipsis"></span><ul class="array collapsible"><li><div class="hoverable collapsed"><div class="collapser"></div><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable collapsed"><span class="property token string">"email"</span>: <span class="token string">&quot;user@example.com&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable collapsed"><span class="property token string">"name"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span></div></li></ul><span class="token punctuation">]</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"ccs"</span>: <div class="collapser"></div><span class="token punctuation">[</span><span class="ellipsis"></span><ul class="array collapsible"><li><div class="hoverable collapsed"><div class="collapser"></div><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable collapsed"><span class="property token string">"email"</span>: <span class="token string">&quot;user@example.com&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable collapsed"><span class="property token string">"name"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span></div></li></ul><span class="token punctuation">]</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"bccs"</span>: <div class="collapser"></div><span class="token punctuation">[</span><span class="ellipsis"></span><ul class="array collapsible"><li><div class="hoverable collapsed"><div class="collapser"></div><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable collapsed"><span class="property token string">"email"</span>: <span class="token string">&quot;user@example.com&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable collapsed"><span class="property token string">"name"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span></div></li></ul><span class="token punctuation">]</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"attachments"</span>: <div class="collapser"></div><span class="token punctuation">[</span><span class="ellipsis"></span><ul class="array collapsible"><li><div class="hoverable collapsed"><div class="collapser"></div><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable collapsed"><span class="property token string">"url"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable collapsed"><span class="property token string">"filename"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span></div></li></ul><span class="token punctuation">]</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"placeholders"</span>: <div class="collapser"></div><span class="token punctuation">[</span><span class="ellipsis"></span><ul class="array collapsible"><li><div class="hoverable collapsed"><div class="collapser"></div><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable collapsed"><span class="property token string">"name"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable collapsed"><span class="property token string">"value"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span></div></li></ul><span class="token punctuation">]</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"key"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span></code></div></div></div></div></div></div></div></div><div><h3 class="sc-fzpans lerNRm"> Response samples </h3><div class="sc-fznzOf jLdbSQ" data-tabs="true"><ul class="react-tabs__tab-list" role="tablist"><li class="tab-success react-tabs__tab--selected" role="tab" id="react-tabs-2" aria-selected="true" aria-disabled="false" aria-controls="react-tabs-3" tabindex="0">200</li></ul><div class="react-tabs__tab-panel react-tabs__tab-panel--selected" role="tabpanel" id="react-tabs-3" aria-labelledby="react-tabs-2"><div><div class="sc-fzpisO dBHtDj"><span class="sc-fzoVTD kNWQuy">Content type</span><div class="sc-fzoJus ixzWHz">application/json</div></div><div class="sc-fznXWL iZtsQe"><div class="sc-fzqMdD cDvkPr"><div class="sc-fzomME ldXyaM"><button><div class="sc-fznAgC jKdGWZ">Copy</div></button><button> Expand all </button><button> Collapse all </button></div><div class="sc-fzoant gGXDRA sc-fzowVh iKXZfK"><div class="redoc-json"><code><div class="collapser"></div><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable "><span class="property token string">"status"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"error"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span></code></div></div></div></div></div></div></div></div></div></div></div></div><div class="sc-oTNDV izusvA"></div></div></div>
+</span></button></div></div></div><div class="sc-AxgMl sc-AxheI hkIgFQ"><div class="sc-oTbqq fJLoZr"><button class="sc-pjSSY ewatGX"><span type="post" class="sc-prOVx hObpXE http-verb post">post</span><span class="sc-paXsP bhaFYt">/sender.php</span><svg class="sc-fznKkj ejwrda" style="margin-right:-25px" version="1.1" viewBox="0 0 24 24" x="0" xmlns="http://www.w3.org/2000/svg" y="0" aria-hidden="true"><polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "></polygon></svg></button><div aria-hidden="true" class="sc-qQmou laHEoQ"><div class="sc-qYiqT kPAzCv"><div class="sc-fzoant sc-fzoYHE eTVXpd"></div><div tabindex="0" role="button"><div class="sc-pAZqv cGlHkj"><span>https://expmail.kumi.live</span>/sender.php</div></div></div></div></div><div><h3 class="sc-fzpans lerNRm"> Request samples </h3><div class="sc-fznzOf jLdbSQ" data-tabs="true"><ul class="react-tabs__tab-list" role="tablist"><li class="react-tabs__tab react-tabs__tab--selected" role="tab" id="react-tabs-0" aria-selected="true" aria-disabled="false" aria-controls="react-tabs-1" tabindex="0">Payload</li></ul><div class="react-tabs__tab-panel react-tabs__tab-panel--selected" role="tabpanel" id="react-tabs-1" aria-labelledby="react-tabs-0"><div><div class="sc-fzpisO dBHtDj"><span class="sc-fzoVTD kNWQuy">Content type</span><div class="sc-fzoJus ixzWHz">application/json</div></div><div class="sc-fznXWL iZtsQe"><div class="sc-fzqMdD cDvkPr"><div class="sc-fzomME ldXyaM"><button><div class="sc-fznAgC jKdGWZ">Copy</div></button><button> Expand all </button><button> Collapse all </button></div><div class="sc-fzoant gGXDRA sc-fzowVh iKXZfK"><div class="redoc-json"><code><div class="collapser"></div><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable "><span class="property token string">"subject"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"html"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"htmlurl"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"text"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"texturl"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"sender"</span>: <div class="collapser"></div><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable collapsed"><span class="property token string">"email"</span>: <span class="token string">&quot;user@example.com&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable collapsed"><span class="property token string">"name"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"recipients"</span>: <div class="collapser"></div><span class="token punctuation">[</span><span class="ellipsis"></span><ul class="array collapsible"><li><div class="hoverable collapsed"><div class="collapser"></div><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable collapsed"><span class="property token string">"email"</span>: <span class="token string">&quot;user@example.com&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable collapsed"><span class="property token string">"name"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span></div></li></ul><span class="token punctuation">]</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"ccs"</span>: <div class="collapser"></div><span class="token punctuation">[</span><span class="ellipsis"></span><ul class="array collapsible"><li><div class="hoverable collapsed"><div class="collapser"></div><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable collapsed"><span class="property token string">"email"</span>: <span class="token string">&quot;user@example.com&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable collapsed"><span class="property token string">"name"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span></div></li></ul><span class="token punctuation">]</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"bccs"</span>: <div class="collapser"></div><span class="token punctuation">[</span><span class="ellipsis"></span><ul class="array collapsible"><li><div class="hoverable collapsed"><div class="collapser"></div><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable collapsed"><span class="property token string">"email"</span>: <span class="token string">&quot;user@example.com&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable collapsed"><span class="property token string">"name"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span></div></li></ul><span class="token punctuation">]</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"attachments"</span>: <div class="collapser"></div><span class="token punctuation">[</span><span class="ellipsis"></span><ul class="array collapsible"><li><div class="hoverable collapsed"><div class="collapser"></div><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable collapsed"><span class="property token string">"url"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable collapsed"><span class="property token string">"filename"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span></div></li></ul><span class="token punctuation">]</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"placeholders"</span>: <div class="collapser"></div><span class="token punctuation">[</span><span class="ellipsis"></span><ul class="array collapsible"><li><div class="hoverable collapsed"><div class="collapser"></div><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable collapsed"><span class="property token string">"name"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable collapsed"><span class="property token string">"value"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span></div></li></ul><span class="token punctuation">]</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"key"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span></code></div></div></div></div></div></div></div></div><div><h3 class="sc-fzpans lerNRm"> Response samples </h3><div class="sc-fznzOf jLdbSQ" data-tabs="true"><ul class="react-tabs__tab-list" role="tablist"><li class="tab-success react-tabs__tab--selected" role="tab" id="react-tabs-2" aria-selected="true" aria-disabled="false" aria-controls="react-tabs-3" tabindex="0">200</li></ul><div class="react-tabs__tab-panel react-tabs__tab-panel--selected" role="tabpanel" id="react-tabs-3" aria-labelledby="react-tabs-2"><div><div class="sc-fzpisO dBHtDj"><span class="sc-fzoVTD kNWQuy">Content type</span><div class="sc-fzoJus ixzWHz">application/json</div></div><div class="sc-fznXWL iZtsQe"><div class="sc-fzqMdD cDvkPr"><div class="sc-fzomME ldXyaM"><button><div class="sc-fznAgC jKdGWZ">Copy</div></button><button> Expand all </button><button> Collapse all </button></div><div class="sc-fzoant gGXDRA sc-fzowVh iKXZfK"><div class="redoc-json"><code><div class="collapser"></div><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable "><span class="property token string">"status"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"error"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span></code></div></div></div></div></div></div></div></div></div></div></div></div><div class="sc-oTNDV izusvA"></div></div></div>
     <script>
-    const __redoc_state = {"menu":{"activeItemIdx":-1},"spec":{"data":{"openapi":"3.0.0","info":{"description":"A simple endpoint to send email messages","version":"0.1","title":"EXPMail","contact":{"email":"support@kumi.systems"}},"tags":[{"name":"sending","description":"Sending out an email"}],"paths":{"/sender.php":{"post":{"tags":["sending"],"summary":"Send out an email","operationId":"sendMail","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/Mail"}}},"description":"Object defining the email message to be sent","required":true},"responses":{"200":{"description":"The request was received and processed.","content":{"application/json":{"schema":{"type":"object","properties":{"status":{"type":"string","description":"\"Success\" if message was successfully sent, else \"error\""},"error":{"type":"string","description":"Error message, only included if an error has occurred"}}}}}}}}}},"servers":[{"url":"https://expmail.kumi.live"}],"components":{"schemas":{"Placeholder":{"type":"object","required":["name"],"properties":{"name":{"type":"string","description":"Name of the placeholder - will be converted to ALL CAPS by the server if it isn't already"},"value":{"type":"string","description":"Value to insert into placeholder"}}},"Attachment":{"type":"object","required":["url"],"properties":{"url":{"type":"string","format":"url","description":"URL from where to fetch the file to attach"},"filename":{"type":"string","description":"File name to use for email attachment. If not set, defaults to name from Content-Disposition header of URL if it exists, else the base name of the URL."}}},"Recipient":{"type":"object","required":["email"],"properties":{"email":{"type":"string","format":"email","description":"Email address of the recipient"},"name":{"type":"string","description":"Name of the recipient"}}},"Mail":{"type":"object","required":["recipients","key"],"properties":{"subject":{"type":"string","description":"Subject of the email"},"html":{"type":"string","description":"String containing the HTML content of the email. Takes precedence over `htmlurl` if provided. If both `html` and `text` or `texturl` are provided, will create a multi-part MIME message."},"htmlurl":{"type":"string","description":"String containing the URL to a file containing the HTML content of the email. Ignored (but still validated) if `html` if provided. If both `htmlurl` and `text` or `texturl` are provided, will create a multi-part MIME message."},"text":{"type":"string","description":"String containing the plain text content of the email. Takes precedence over `texturl` if provided. If both `text` and `html` or `htmlurl` are provided, will create a multi-part MIME message."},"texturl":{"type":"string","description":"String containing the URL to a file containing the plain text content of the email. Ignored (but still validated) if `text` is provided. If both `texturl` and `html` or `htmlurl` are provided, will create a multi-part MIME message."},"recipients":{"type":"array","description":"Array of `Recipient` objects to be used as \"To:\" addresses for the email","items":{"$ref":"#/components/schemas/Recipient"}},"ccs":{"type":"array","description":"Array of `Recipient` objects to be used as \"CC:\" addresses for the email","items":{"$ref":"#/components/schemas/Recipient"}},"bccs":{"type":"array","description":"Array of `Recipient` objects to be used as \"BCC:\" addresses for the email","items":{"$ref":"#/components/schemas/Recipient"}},"attachments":{"type":"array","description":"Array of `Attachment` objects to be attached to the email","items":{"$ref":"#/components/schemas/Attachment"}},"placeholders":{"type":"array","description":"Array of `Placeholder` objects. Any occurrences of `{PLACEHOLDER_NAME}` (`name` in all caps enclosed with curly brackets) in the email's HTML or plain text will be replaced by `value`.","items":{"$ref":"#/components/schemas/Placeholder"}},"key":{"type":"string","description":"API key to authenticate request with"}}}}}}},"searchIndex":{"store":["tag/sending","operation/sendMail"],"index":{"version":"2.3.8","fields":["title","description"],"fieldVectors":[["title/0",[0,0.168]],["description/0",[0,0.095,1,0.129,2,0.129]],["title/1",[0,0.111,1,0.151,2,0.151]],["description/1",[]]],"invertedIndex":[["email",{"_index":2,"title":{"1":{}},"description":{"0":{}}}],["out",{"_index":1,"title":{"1":{}},"description":{"0":{}}}],["send",{"_index":0,"title":{"0":{},"1":{}},"description":{"0":{}}}]],"pipeline":[]}},"options":{}};
+    const __redoc_state = {"menu":{"activeItemIdx":-1},"spec":{"data":{"openapi":"3.0.0","info":{"description":"A simple endpoint to send email messages","version":"0.1","title":"EXPMail","contact":{"email":"support@kumi.systems"}},"tags":[{"name":"sending","description":"Sending out an email"}],"paths":{"/sender.php":{"post":{"tags":["sending"],"summary":"Send out an email","operationId":"sendMail","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/Mail"}}},"description":"Object defining the email message to be sent","required":true},"responses":{"200":{"description":"The request was received and processed.","content":{"application/json":{"schema":{"type":"object","properties":{"status":{"type":"string","description":"\"Success\" if message was successfully sent, else \"error\""},"error":{"type":"string","description":"Error message, only included if an error has occurred"}}}}}}}}}},"servers":[{"url":"https://expmail.kumi.live"}],"components":{"schemas":{"Placeholder":{"type":"object","required":["name"],"properties":{"name":{"type":"string","description":"Name of the placeholder - will be converted to ALL CAPS by the server if it isn't already"},"value":{"type":"string","description":"Value to insert into placeholder"}}},"Attachment":{"type":"object","required":["url"],"properties":{"url":{"type":"string","format":"url","description":"URL from where to fetch the file to attach"},"filename":{"type":"string","description":"File name to use for email attachment. If not set, defaults to name from Content-Disposition header of URL if it exists, else the base name of the URL."}}},"Recipient":{"type":"object","required":["email"],"properties":{"email":{"type":"string","format":"email","description":"Email address of the recipient"},"name":{"type":"string","description":"Name of the recipient"}}},"Mail":{"type":"object","required":["recipients","key"],"properties":{"subject":{"type":"string","description":"Subject of the email"},"html":{"type":"string","description":"String containing the HTML content of the email. Takes precedence over `htmlurl` if provided. If both `html` and `text` or `texturl` are provided, will create a multi-part MIME message."},"htmlurl":{"type":"string","description":"String containing the URL to a file containing the HTML content of the email. Ignored (but still validated) if `html` if provided. If both `htmlurl` and `text` or `texturl` are provided, will create a multi-part MIME message."},"text":{"type":"string","description":"String containing the plain text content of the email. Takes precedence over `texturl` if provided. If both `text` and `html` or `htmlurl` are provided, will create a multi-part MIME message."},"texturl":{"type":"string","description":"String containing the URL to a file containing the plain text content of the email. Ignored (but still validated) if `text` is provided. If both `texturl` and `html` or `htmlurl` are provided, will create a multi-part MIME message."},"sender":{"allOf":[{"description":"`Recipient` object to be used as \"From:\" address for the email"},{"$ref":"#/components/schemas/Recipient"}]},"recipients":{"type":"array","description":"Array of `Recipient` objects to be used as \"To:\" addresses for the email","items":{"$ref":"#/components/schemas/Recipient"}},"ccs":{"type":"array","description":"Array of `Recipient` objects to be used as \"CC:\" addresses for the email","items":{"$ref":"#/components/schemas/Recipient"}},"bccs":{"type":"array","description":"Array of `Recipient` objects to be used as \"BCC:\" addresses for the email","items":{"$ref":"#/components/schemas/Recipient"}},"attachments":{"type":"array","description":"Array of `Attachment` objects to be attached to the email","items":{"$ref":"#/components/schemas/Attachment"}},"placeholders":{"type":"array","description":"Array of `Placeholder` objects. Any occurrences of `{PLACEHOLDER_NAME}` (`name` in all caps enclosed with curly brackets) in the email's HTML or plain text will be replaced by `value`.","items":{"$ref":"#/components/schemas/Placeholder"}},"key":{"type":"string","description":"API key to authenticate request with"}}}}}}},"searchIndex":{"store":["tag/sending","operation/sendMail"],"index":{"version":"2.3.8","fields":["title","description"],"fieldVectors":[["title/0",[0,0.168]],["description/0",[0,0.095,1,0.129,2,0.129]],["title/1",[0,0.111,1,0.151,2,0.151]],["description/1",[]]],"invertedIndex":[["email",{"_index":2,"title":{"1":{}},"description":{"0":{}}}],["out",{"_index":1,"title":{"1":{}},"description":{"0":{}}}],["send",{"_index":0,"title":{"0":{},"1":{}},"description":{"0":{}}}]],"pipeline":[]}},"options":{}};
 
     var container = document.getElementById('redoc');
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diff --git a/doc/swagger.json b/doc/swagger.json
deleted file mode 100644
index 14ebd06..0000000
--- a/doc/swagger.json
+++ /dev/null
@@ -1,188 +0,0 @@
-{
-  "openapi": "3.0.0",
-  "info": {
-    "description": "A simple endpoint to send email messages",
-    "version": "0.1",
-    "title": "EXPMail",
-    "contact": {
-      "email": "support@kumi.systems"
-    }
-  },
-  "tags": [
-    {
-      "name": "sending",
-      "description": "Sending out an email"
-    }
-  ],
-  "paths": {
-    "/sender.php": {
-      "post": {
-        "tags": [
-          "sending"
-        ],
-        "summary": "Send out an email",
-        "operationId": "sendMail",
-        "requestBody": {
-          "content": {
-            "application/json": {
-              "schema": {
-                "$ref": "#/components/schemas/Mail"
-              }
-            }
-          },
-          "description": "Object defining the email message to be sent",
-          "required": true
-        },
-        "responses": {
-          "200": {
-            "description": "The request was received and processed.",
-            "content": {
-              "application/json": {
-                "schema": {
-                  "type": "object",
-                  "properties": {
-                    "status": {
-                      "type": "string",
-                      "description": "\"Success\" if message was successfully sent, else \"error\""
-                    },
-                    "error": {
-                      "type": "string",
-                      "description": "Error message, only included if an error has occurred"
-                    }
-                  }
-                }
-              }
-            }
-          }
-        }
-      }
-    }
-  },
-  "servers": [
-    {
-      "url": "https://expmail.kumi.live"
-    }
-  ],
-  "components": {
-    "schemas": {
-      "Placeholder": {
-        "type": "object",
-        "required": [
-          "name"
-        ],
-        "properties": {
-          "name": {
-            "type": "string",
-            "description": "Name of the placeholder - will be converted to ALL CAPS by the server if it isn't already"
-          },
-          "value": {
-            "type": "string",
-            "description": "Value to insert into placeholder"
-          }
-        }
-      },
-      "Attachment": {
-        "type": "object",
-        "required": [
-          "url"
-        ],
-        "properties": {
-          "url": {
-            "type": "string",
-            "format": "url",
-            "description": "URL from where to fetch the file to attach"
-          },
-          "filename": {
-            "type": "string",
-            "description": "File name to use for email attachment. If not set, defaults to name from Content-Disposition header of URL if it exists, else the base name of the URL."
-          }
-        }
-      },
-      "Recipient": {
-        "type": "object",
-        "required": [
-          "email"
-        ],
-        "properties": {
-          "email": {
-            "type": "string",
-            "format": "email",
-            "description": "Email address of the recipient"
-          },
-          "name": {
-            "type": "string",
-            "description": "Name of the recipient"
-          }
-        }
-      },
-      "Mail": {
-        "type": "object",
-        "required": [
-          "recipients",
-          "key"
-        ],
-        "properties": {
-          "subject": {
-            "type": "string",
-            "description": "Subject of the email"
-          },
-          "html": {
-            "type": "string",
-            "description": "String containing the HTML content of the email. Takes precedence over `htmlurl` if provided. If both `html` and `text` or `texturl` are provided, will create a multi-part MIME message."
-          },
-          "htmlurl": {
-            "type": "string",
-            "description": "String containing the URL to a file containing the HTML content of the email. Ignored (but still validated) if `html` if provided. If both `htmlurl` and `text` or `texturl` are provided, will create a multi-part MIME message."
-          },
-          "text": {
-            "type": "string",
-            "description": "String containing the plain text content of the email. Takes precedence over `texturl` if provided. If both `text` and `html` or `htmlurl` are provided, will create a multi-part MIME message."
-          },
-          "texturl": {
-            "type": "string",
-            "description": "String containing the URL to a file containing the plain text content of the email. Ignored (but still validated) if `text` is provided. If both `texturl` and `html` or `htmlurl` are provided, will create a multi-part MIME message."
-          },
-          "recipients": {
-            "type": "array",
-            "description": "Array of `Recipient` objects to be used as \"To:\" addresses for the email",
-            "items": {
-              "$ref": "#/components/schemas/Recipient"
-            }
-          },
-          "ccs": {
-            "type": "array",
-            "description": "Array of `Recipient` objects to be used as \"CC:\" addresses for the email",
-            "items": {
-              "$ref": "#/components/schemas/Recipient"
-            }
-          },
-          "bccs": {
-            "type": "array",
-            "description": "Array of `Recipient` objects to be used as \"BCC:\" addresses for the email",
-            "items": {
-              "$ref": "#/components/schemas/Recipient"
-            }
-          },
-          "attachments": {
-            "type": "array",
-            "description": "Array of `Attachment` objects to be attached to the email",
-            "items": {
-              "$ref": "#/components/schemas/Attachment"
-            }
-          },
-          "placeholders": {
-            "type": "array",
-            "description": "Array of `Placeholder` objects. Any occurrences of `{PLACEHOLDER_NAME}` (`name` in all caps enclosed with curly brackets) in the email's HTML or plain text will be replaced by `value`.",
-            "items": {
-              "$ref": "#/components/schemas/Placeholder"
-            }
-          },
-          "key": {
-            "type": "string",
-            "description": "API key to authenticate request with"
-          }
-        }
-      }
-    }
-  }
-}
\ No newline at end of file
diff --git a/doc/swagger.yaml b/doc/swagger.yaml
new file mode 100644
index 0000000..4a2fd9b
--- /dev/null
+++ b/doc/swagger.yaml
@@ -0,0 +1,130 @@
+openapi: 3.0.0
+info:
+  description: A simple endpoint to send email messages
+  version: '0.1'
+  title: EXPMail
+  contact:
+    email: support@kumi.systems
+tags:
+  - name: sending
+    description: Sending out an email
+paths:
+  /sender.php:
+    post:
+      tags:
+        - sending
+      summary: Send out an email
+      operationId: sendMail
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/Mail'
+        description: Object defining the email message to be sent
+        required: true
+      responses:
+        '200':
+          description: The request was received and processed.
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  status:
+                    type: string
+                    description: '"Success" if message was successfully sent, else "error"'
+                  error:
+                    type: string
+                    description: 'Error message, only included if an error has occurred'
+servers:
+  - url: 'https://expmail.kumi.live'
+components:
+  schemas:
+    Placeholder:
+      type: object
+      required:
+        - name
+      properties:
+        name:
+          type: string
+          description: Name of the placeholder - will be converted to ALL CAPS by the server if it isn't already
+        value:
+          type: string
+          description: Value to insert into placeholder
+    Attachment:
+      type: object
+      required:
+        - url
+      properties:
+        url:
+          type: string
+          format: url
+          description: URL from where to fetch the file to attach
+        filename:
+          type: string
+          description: 'File name to use for email attachment. If not set, defaults to name from Content-Disposition header of URL if it exists, else the base name of the URL.'
+    Recipient:
+      type: object
+      required:
+        - email
+      properties:
+        email:
+          type: string
+          format: email
+          description: Email address of the recipient
+        name:
+          type: string
+          description: Name of the recipient
+    Mail:
+      type: object
+      required:
+        - recipients
+        - key
+      properties:
+        subject:
+          type: string
+          description: Subject of the email
+        html:
+          type: string
+          description: 'String containing the HTML content of the email. Takes precedence over `htmlurl` if provided. If both `html` and `text` or `texturl` are provided, will create a multi-part MIME message.'
+        htmlurl:
+          type: string
+          description: 'String containing the URL to a file containing the HTML content of the email. Ignored (but still validated) if `html` if provided. If both `htmlurl` and `text` or `texturl` are provided, will create a multi-part MIME message.'
+        text:
+          type: string
+          description: 'String containing the plain text content of the email. Takes precedence over `texturl` if provided. If both `text` and `html` or `htmlurl` are provided, will create a multi-part MIME message.'
+        texturl:
+          type: string
+          description: 'String containing the URL to a file containing the plain text content of the email. Ignored (but still validated) if `text` is provided. If both `texturl` and `html` or `htmlurl` are provided, will create a multi-part MIME message.'
+        sender:
+          allOf:
+            - description: '`Recipient` object to be used as "From:" address for the email'
+            - $ref: '#/components/schemas/Recipient'
+        recipients:
+          type: array
+          description: 'Array of `Recipient` objects to be used as "To:" addresses for the email'
+          items:
+            $ref: '#/components/schemas/Recipient'
+        ccs:
+          type: array
+          description: 'Array of `Recipient` objects to be used as "CC:" addresses for the email'
+          items:
+            $ref: '#/components/schemas/Recipient'
+        bccs:
+          type: array
+          description: 'Array of `Recipient` objects to be used as "BCC:" addresses for the email'
+          items:
+            $ref: '#/components/schemas/Recipient'
+        attachments:
+          type: array
+          description: Array of `Attachment` objects to be attached to the email
+          items:
+            $ref: '#/components/schemas/Attachment'
+        placeholders:
+          type: array
+          description: 'Array of `Placeholder` objects. Any occurrences of `{PLACEHOLDER_NAME}` (`name` in all caps enclosed with curly brackets) in the email''s HTML or plain text will be replaced by `value`.'
+          items:
+            $ref: '#/components/schemas/Placeholder'
+        key:
+          type: string
+          description: API key to authenticate request with
diff --git a/sender.php b/sender.php
index ff125d4..e905eea 100644
--- a/sender.php
+++ b/sender.php
@@ -36,7 +36,11 @@ try {
     $mailer->Port = ($MAIL_PORT ? $MAIL_PORT : ($MAIL_SMTPS ? 465 : 587));
     $mailer->XMailer = "Kumi Systems Mailer 0.1 (https://kumi.systems/)";
 
-    $mailer->setFrom(($MAIL_FROM_MAIL ? $MAIL_FROM_MAIL : $MAIL_USER), $MAIL_FROM_NAME);
+    if ($json["sender"]["email"]) {
+        $mailer->setFrom($json["sender"]["email"], $json["sender"]["name"]);
+    } else {
+        $mailer->setFrom(($MAIL_FROM_MAIL ? $MAIL_FROM_MAIL : $MAIL_USER), $MAIL_FROM_NAME);
+    };
 
     foreach ($json["recipients"] as $recipient) $mailer->addAddress($recipient["email"], $recipient["name"]);
     foreach ($json["ccs"] as $cc) $mailer->addCC($cc["email"], $cc["name"]);