On Tue, Jan 30, 2024 at 07:57:18PM +0100, Maurizio Caloro via Postfix-users 
wrote:

> if adding a new user with postfixadmin 3.3.8 or with cli this will run
> without problem.
> 
> GRANT ALL PRIVILEGES ON mailserver.* TO markus@'domain.com
> <mailto:markus@'domain.com> ' IDENTIFIED BY
> '***********************************';

That SQL syntax is for adding a database *administrator* account, not
for adding an email mailbox or alias...  Why are you attempting to
give the user database access privileges?

> postfix/lmtp[102470]: 3E101208A1: to= <mailto:mar...@domain.com>
> mar...@domain.com, relay=mail.domain.com[private/dovecot-lmtp],
> delay=0.12, delays=0.06/0.01/0.02/0.02, dsn=5.1.1, status=bounced (host
> mail.domain.com[private/dovecot-lmtp]
> said: 550 5.1.1 mar...@domain.com <mailto:mar...@domain.com>  User doesn't
> exist: mar...@domain.com <mailto:mar...@domain.com>  (in reply to RCPT TO
> command))

Postfix is not the responsible party here, just the messenger.  It is
dovecot LMTP that is rejecting the user, and you should seek help
primarily on the Dovecot list.

-- 
    Viktor.
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