Issue Inbound email ok. Forwarded mail rejected as spam

[Alex Presland]

Server operating system version

Ubuntu 22.04.3 LTS

Plesk version and microupdate number

Plesk Obsidian Version 18.0.58 Update #2, last updated on Jan 26, 2024 06:29 AM

I'm not really sure what is going on here... but I've got perfectly valid non-spam email coming into our Plesk server. However, when it is forwarded it is rejected before being sent.
@danami any idea how this can be please?

The email is going user@ntlworld.com --> committee@plesk.domain (which is a forwarding list) to multiple firstname@plesk.domain addresses. Each of these firstname@plesk.domain addresses forward to other external email addresses.

 

[cmartinez127]

I already got a related problem. Send a forwarded email to Learn and Test DMARC this tool will show you if you have any DNS problem.

 

[danami]

@Alex Presland Enable verbose mode in Amavis so that you can see what rules are being matched:

How can I view what SpamAssassin rules were matched by a message? - Knowledgebase - Danami

Also it looks like your server wide policy spam level is set to 5 which might be too aggressive.