Subject of the email

String containing the HTML content of the email. Takes precedence over htmlurl if provided. If both html and text or texturl are provided, or the noconversion config key is not provided, will create a multi-part MIME message.

String containing the URL to a file containing the HTML content of the email. Ignored if html if provided. If both htmlurl and text or texturl are provided, or the noconversion config key is not provided, will create a multi-part MIME message.

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.

String containing the URL to a file containing the plain text content of the email. Ignored if text is provided. If both texturl and html or htmlurl are provided, will create a multi-part MIME message.

Recipient object to be used as "From:" address for the email

Array of Recipient objects to be used as "To:" addresses for the email

Array of Recipient objects to be used as "CC:" addresses for the email

Array of Recipient objects to be used as "BCC:" addresses for the email

Array of Attachment objects to be attached to the email

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.

Array of Config keys to change the default behaviour

• allowempty - Allow messages to have an empty body, would otherwise return an error
• ignoredlfails - If an attachment fails to download, just leave it out and continue processing the message
• noconversion - Do not automatically convert HTML to plain text if no plain text message is explicitly given
• urlbeforestring - If both a string and a URL are given for the HTML or plain text content, prefer URL (else: prefer string)