XenForo Queued mail failed to be sent due to a mail_data error

[Old Nick]

What's wrong with my settings ?

Code:

ErrorException: Queued mail failed to be sent due to a mail_data error. The queued email entry has been deleted. src/XF/Error.php:79

Code:

#0 src/XF.php(225): XF\Error->logError('Queued mail fai...', false)
#1 src/XF/Job/MailSend.php(33): XF::logError('Queued mail fai...')
#2 src/XF/Job/Manager.php(272): XF\Job\MailSend->run(7.30551)
#3 src/XF/Job/Manager.php(202): XF\Job\Manager->runJobInternal(Array, 7.30551)
#4 src/XF/Job/Manager.php(86)...

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