[Postfixbuch-users] Probleme bei der Auslieferung von Postfix an cyrus (550-Mailbox unknown)

[Stéphane Lux]

Hallo,

bei dem Versuch der Zustellung eine Mail an user at example.com erhalte  
ich folgende Fehlermeldung:

<user at example.com>: host server.com[/var/run/cyrus/socket/lmtp] said:
    550-Mailbox unknown.  Either there is no mailbox associated with  
this
    550-name or you do not have authorization to see it. 550 5.1.1  
User unknown
    (in reply to RCPT TO command)
Reporting-MTA: dns; server.com
X-Postfix-Queue-ID: 1A02534E8060
X-Postfix-Sender: rfc822; stephane at lux.io
Arrival-Date: Wed,  4 Nov 2009 14:39:32 +0100 (CET)

Final-Recipient: rfc822; user at example.com
Original-Recipient: rfc822;user at example.com
Action: failed
Status: 5.1.1
Remote-MTA: dns; server.com
Diagnostic-Code: smtp; 550-Mailbox unknown.  Either there is no mailbox
    associated with this 550-name or you do not have authorization to  
see it.
    550 5.1.1 User unknown

Der User existiert aber:

server.com:~# cyradm -u cyrus localhost
Password:
server.com.dedicated.hosteurope.de> lam user/user at example.com
user at example.com lrswipcda
server.com.dedicated.hosteurope.de>

Woran könnte es liegen?

Stéphane Lux