diff --git a/sender.php b/sender.php
index 3383ecd..c2dc76a 100644
--- a/sender.php
+++ b/sender.php
@@ -29,6 +29,7 @@ try {
     $mailer->Password = $MAIL_PASS;
     $mailer->SMTPSecure = ($MAIL_STARTTLS ? PHPMailer::ENCRYPTION_STARTTLS : ($MAIL_SMTPS ? PHPMailer::ENCRYPTION_SMTPS : false));
     $mailer->Port = ($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);