Solved XenForo should set the "Auto-Submitted: auto-generated" header when sending emails

[Steffen]

"Process mails from web applications like e-mail address verification and password reset mails should be tagged as 'automatically submitted' so that mail servers do not respond with 'Out of office' or vacation notification mails." – http://cweiske.de/tagebuch/laravel-notification-autosubmit.htm

I think this applies to all emails sent by XenForo.

Maybe it would make sense to set the non-standard header "Precedence: bulk", too. Afaik it is older and some software might not support...

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