dovecot - Dec 2010 - user xxx@mydomain.com doesn't exist

new setup of Dovecot 2.0.8 with postfix
local users are simply defined as Linux users named xxx, yyy et cetera;
IMAP access is fine with that users.
Postfix is delivering mails with two domains (to xxx at mydomain.com or
xxx at mydomain.org) and these are rejected by dovecot with 550: user
doesn't exist.

I've tested the possible usernames with "doveadm user"
xxx: okay
xxx at mydoman.com: "userdb lookup: user xxx at mydomain.com doesn't
exist"
xxx at mydoman.org: "userdb lookup: user xxx at mydomain.org doesn't
exist"

Dovecot2 wiki says "Dovecot doesn't care much about domains in
usernames"
Okay, how to I get dovecot to ignore the domain part (or accept the two
defined domains) when mails are delivered from postfix?
Or do I have to configure Postfix to strip the domain part before
delivering to dovecot?

Regards
Birte Nauer

On Fri, 2010-12-31 at 01:54 +0100, G.Nau wrote:
> Dovecot2 wiki says "Dovecot doesn't care much about domains in
usernames"
> Okay, how to I get dovecot to ignore the domain part (or accept the two
> defined domains) when mails are delivered from postfix?
> Or do I have to configure Postfix to strip the domain part before
> delivering to dovecot? 
Either that, or make Dovecot strip it:

auth_username_format = %Ln

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