This mail cannot be forwarded because it was detected as spam

Operating System & Version
Centos 7.9


Nov 19, 2015
cPanel Access Level
Root Administrator

A customer set up a forwarder for his account to icloud (another customer uses gmail, same behaviour).
He is receiving emails fine.
But, I'm seeing lots of emails in the server's email queue being sent back to the original sender, with the message:

From: Mail Delivery System
To: [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 [email protected])
This mail cannot be forwarded because it was detected as spam.

So, the local account [email protected] forwards to [email protected]

How can I prevent this messages to be sent back to sender ?
Last edited by a moderator:


Jurassic Moderator
Staff member
Oct 19, 2014
cPanel Access Level
Root Administrator
Hey there! It would seem the spam filtering is happening on the icloud side of things based on those bounceback messages. If you check the mail queue for the message ID of the bounceback you may be able to find more information about the issue. If not, you might need to contact icloud directly to see if they can provide more details on why they are marking this particular message as spam.