Outgoing Emails flagged as SPAM by CpanelEximScanner and connections rejected due to RFC2821 4.1.1.1

Joao Terramoto

• December 18, 2025 10:58

Hello,

Since last week updates, some of our customers who are using invoicing software have started to get their outgoing emails rejected by the server due to being flagged as spam by cpaneleximscanner. This rejection happens during DATA transmission which causes no bounce or log with information to be generated on the server and thus we're not able to check which scores were flagged. The spamd_error log also doesn't provide much information other than the flagging report.
One other thing that happen as well is  that this clients are getting their connections rejected with the error "Invalid HELO name (See RFC2821 4.1.1.1).

Would someone be able to point out what changed in exim.conf with this month's updates? I'm aware there were changes to Dovecot and Exim but the changelogs don't elaborate in detail.

 

• 

  cPRex Jurassic Moderator

  • December 18, 2025 13:11

  Hey there!  I'd encourage you to submit a ticket as some other users have reported this here:

  https://support.cpanel.net/hc/en-us/community/posts/37028318150167-Outgoing-spam-false-positives?page=1#community_comment_37116305531159

  but so far we haven't been able to reproduce this on our end.  If you have a system where this is actively happening, we'd like to take a look.

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