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I also uninstalled

#7 src/addons/Andy/EmailLog/XF/Mail/Mailer.php(10): XF\Mail\Mailer-&gt;send(Object(Swift_Message))<br>

But still have this issue.

We use Amazon SES for our mail relaying, and they are quite fussy about headers being correct.

I've commented out this line in src/XF/Mail/Mail.php (526) until a fix is provided:

[CODE=php]# $message->getHeaders()->addTextHeader('Auto-Submitted', $this->autoSubmitted);[/CODE]