Debian User Forums

Hello!
I removed no_address_mappings in master.cf and everything works perfectly.
Problem solved!

Many thanks for the support!

any ideas where I can look for a solution?

In mysql there is no difference between the two queries, so it is not a database problem or the query mode.
If I use Roundcube to send mail from any <any_address@my-domain> to alias@my-domain it works without any problems.
Just using any email client, both from inside the network and from outside, I get the message "unknown user"

Postfix log for <my-address@gmail.com> to <alias@my-domain>:
2025-01-12T08:54:38.944224+02:00 mail postfix/postscreen[418067]: CONNECT from [209.85.218.47]:50282 to ...

I installed and configured mail server on Debian 12 with Postfix (virtual users in mysql).
Everything is ok, until I needed an alias like alias@domain.com to direct emails to user1@domain.com and user2@domain.com.
From the other domain alias works ok, from my domains, with address like any_address@domain.com, with e-mail client (outlook, thunderbird...) any email sent to alias@domain.com returns the error "User doesn't exist: alias@domain.com". From Roundcube (localhost), from any_address@domain ...