Issue Exclude DKIM verification for incoming mail. Plesk solution not working

[LinqLOL]

Server operating system version

RHEL 8.6

Plesk version and microupdate number

18.0.56 Update #1

For one of our customers mails from one sender is rejected, because of an dkim verification message. Google is accepting these mails without problem. This could have multiple reasons so my idea was to skip DKIM verification for certain senders.

I did find a (new) solution at https://support.plesk.com/hc/en-us/...-a-domain-from-DMARC-check-in-Plesk-for-Linux which is exactly what I needed.

But following these steps still makes the mails get rejected:

Oct 23 08:37:54 srv40 dk_check[1157862]: 6414456012A: DKIM verification (d=mail.example.com, 1024-bit key) failed: signature verification failed
Oct 23 08:37:54 srv40 postfix-local[1157861]: 6414456012A: dk_check: stderr: PASS

Am I missing something?

 

[Peter Debik]

Hi @LinqLOL , thank you for your post. Could you please contact Plesk support on it? Then an engineer can check it directly on your server.

https://support.plesk.com

 

[eronardiaras]

Similar problem.

For the past few days, emails sent from one external domain to our plesk server are not arriving. (They always arrived without any problems before.) However, they are arriving on our other plesk server. (Same settings on both servers.)

- Added the domain ("@example.com") to the whitelist.
- Plesk Email Security enabled.
- Added ("IgnoreMailFrom example.com") to /etc/psa/dmarc.conf
- This was executed:
plesk bin settings -s mail_dmarc_reject_at_smtp=true && plesk repair mail -y

Emails are still not arriving, just like the topic starter wrote.

 

[Kaspar]

@eronardiaras, you're problem description seems to differ from the issue described by the OP. The OP describes an issue specific to message rejected because of DKIM. Which is NOT the same as having a problem with receiving mail.

Rather than posting in multiple existing threads, please open your own thread with clear information on the exact issue you're encountering. Including relevant mail log entries.

 

[eronardiaras]

@eronardiaras, you're problem description seems to differ from the issue described by the OP. The OP describes an issue specific to message rejected because of DKIM. Which is NOT the same as having a problem with receiving mail.

Rather than posting in multiple existing threads, please open your own thread with clear information on the exact issue you're encountering. Including relevant mail log entries.

I also have the dkim error:
"DKIM verification (d=example.com, 2048-bit key) failed: signature verification failed"

But then I'll open a new post.

 

[Kaspar]

I also have the dkim error:
"DKIM verification (d=example.com, 2048-bit key) failed: signature verification failed"

That would have been worth mentioning in your initial post. It's pretty essential information to diagnose the issue

Did you check whether or not the signature is actually valid and if it is, if there are perhaps conflicting DKIM records? Or if there are any DNS/lookup issue's to fetch the public key?