SOLVED Problem with the incoming email by one account


Jan 18, 2021
cPanel Access Level
Root Administrator

I have more accounts on my whm server and one of my costumer has problem with his emails. Many of his partners get this answer from our server:
Mail delivery failed: returning message to sender
Mon, 12 Sep 2022 20:53:07 +0200
Mail Delivery System <[email protected]********
[email protected]***

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

[email protected]
(ultimately generated from a****[email protected]****
host []
SMTP error from remote mail server after end of data:
550-5.7.1 [**********12] Our system has detected that this message is
550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail,
550-5.7.1 this message has been blocked. Please visit
550 5.7.1 for more information."

I check it in email logs , and the strange thing is that my costumer get every email twice, one is goes wrong and get this answer, and one is accepted.
Képernyőfotó 2022-09-23 - 15.31.25.png

In the accepted email information everything seems normal
Képernyőfotó 2022-09-23 - 15.30.38.png

But in the other email something goes wrong with the gmail, but neither the sender nor the receiver has anything to do with gmail.
Képernyőfotó 2022-09-23 - 15.31.01.png

the other accounts are working fine.

Thanks for helping me!


Jurassic Moderator
Staff member
Oct 19, 2014
cPanel Access Level
Root Administrator
Hey there! Are there any forwarders are filters on the account that may be duplicating this message? If not, this might be a better question for Gmail, since they are the ones filtering that particular message. It also doesn't make sense to me how one message could be accepted and another rejected if they are coming from the same machine, so talking to Gmail directly would be the best plan.