حل مشكلة 550 "The mail server detected your message as spam and has prevented deliver
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error.

الخطوات من cpanel :

set the SpamAssassin "reject score threshold". That will kill spam mail with the same message at SMtP time, meaning it's up to the sending mail server to generate and handle the bounce (most spam servers don't bother).







الخطوات من whm لكى تكون عامه على كل الحسابات :

المطلوب هو جعل score بدل من 5 يكون 8 او 10 لكى تحل هذه المشكلة

"Apache SpamAssassin Options" tab in "WHM >> Service Configuration >> Exim Configuration Manager" and adjust the following option:

"Scan outgoing messages for spam and reject based on defined Apache SpamAssassin™ score"


You can increase the value you want utilized for SPAM detection.

المرجع:
https://forums.cpanel.net/threads/th...livery.309052/
https://forums.cpanel.net/threads/em...vering.540151/
https://forums.cpanel.net/threads/th...s-spam.613063/