Mail forwarding doesn't work if "Mail Forward" option is used

Hello. I'm using centos 9+Postfix+Dovecot.
If a user manually uses the left-column "Mail Forward" option, no mail goes out. Not to the mailbox that receives it, nor to the mail that it suppose to forward to.
However, if those forwards are Deleted and then the:
Send copy to
Copy during delivery
options are selected in that mailbox's properties, it then works fine.
The trouble is, the migration tool favored the Mail Forward option and I have lots of Mail Forward's already in place. What could cause the Mail Forward not to work at all?

 

I am seeing things like this:
Mar 10 10:04:26 latte postfix/cleanup[36057]: warning: 40F361000167D1: unreasonable virtual_alias_maps map nesting for [email protected] -- message not accepted, try again later

Yes, they created loops

 

What is the hostname and fqdn of the mailserver? Is it "xyz.com"?

 

Oh, I always try to anonymize those things, it was siparis (at) pemsan.com. the server is latte.kalfaoglu.net
they made forward loops at the old plesk server, and those were carried to the new server with the migration.
like info@them -> someone@them
(....)
someone@them -> info@them

 

Ok so it was a unintentional misconfiguration on your side then i see. Thought there still was an issue and asked for the hostname because it is possible to set it to "domain.tld" and use domain.tld within aliasmaps which will cause issues like this.

 

Many thanks everyone for your help!