Virtual domains, Mailbox unknown

Mike O'Rourke mjoop at
Mon Feb 16 12:31:19 EST 2004

>From: Henrik Troeng <henrik at>
>Sent: Feb 16, 2004 6:17 AM
>To: info-cyrus at 
>Subject: Virtual domains, user at Mailbox unknown
>Hi all,
>I have a problem, I use multiple domains but for users I create with
>domain specified, for example postmaster at it can't
>mail. When I try to send to this user I get back a reply from
>that says "550-Mailbox Unknown". Either there is no mailbox
>550-name or you don't have authorization to see it".
>If I create the user "user.postmaster" it works fine, but the user
>"user.postmaster at" wont accept any mail.
>Here is my imapd.conf:
>configdirectory: /var/imap
>partition-default: /var/spool/imap
>admins: cyrus root Henrik
>sasl_pwcheck_method: saslauthd
>sasl_mech_list: PLAIN LOGIN
>sendmail: /usr/sbin/sendmail
>virtdomains: yes
>I have set up the domain in the local-host-names config file for
>Here is the error message:
>"The original message was received at Mon, 16 Feb 2004 12:47:04 +0100
>from []
>   ----- The following addresses had permanent fatal errors -----
>    (reason: 550-Mailbox unknown.  Either there is no mailbox
associated with this)
>    (expanded from: <postmaster at>)
>   ----- Transcript of session follows -----
>... while talking to localhost:
>>>> DATA
><<< 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
>550 5.1.1 root... User unknown
><<< 503 5.5.1 No recipients

Hi Henrik,

You evidently have postmaster aliased to root in /etc/mail/aliases (a
common; nay default alias in sendmail), so sendmail will never try to
deliver to postmaster, but only to root (as evidenced by the "(expanded
from: <postmaster at>)" line).

Either change the alias to send it to the correct user (don't forget to
re-build the aliases database!), or delete it (ditto on the "don't
forget") and let it go to the postmaster mailbox you have created.

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