[Mailman-Users] Unknown user when using virtual mailboxes

Mark Sapiro mark at msapiro.net
Sun Mar 4 16:52:56 CET 2012

David Renstrom wrote:
>I've set up a system with Postfix, Dovecot and Mailman under Fedora. I'm
>using MySQL and Postfixadmin to administrate the virtual mailboxes. I'm
>unable to get emails delivered to the mailing lists created with Mailman
>though. I've added the required strings to alias_maps and virtual_alias_maps
>in main.cf of Postfix:
>alias_maps = hash:/etc/mailman/aliases, mysq:/etc/postfix/alias_sql.cf
>virtual_alias_maps = hash:/etc/mailman/virtual-mailman,
>I've created a mailing list called test for my virtual domain mydomain.se
>and everything seems to be correct in /etc/mailman/virtual-mailman and

Are the timestamps on /etc/mailman/virtual-mailman.db and
/etc/mailman/aliases.db as recent as those on
/etc/mailman/virtual-mailman and /etc/mailman/aliases.

>Example from /etc/mailman/virtual-mailman:
>test at mydomain.se	test
>Example from /etc/mailman/aliases:
>test:	"|/usr/lib/mailman/mail/mailman post test"
>I've also added the following string to /etc/mailman/mm_cfg.py:
>add_virtualhost('www.mydomain.se', 'mydomain.se')
>MTA = 'Postfix'
>Why do I get the "Unknown user" reply from Postfix when sending an email to
>test at mydomain.se? What could I have missed? I've tried to Google this
>problem but have come up with nothing really useful. Could you please point
>me in the right direction?
>This is some output from the /var/log/maillog file:
>Mar  4 14:24:58 rus01 postfix/smtpd[7481]: connect from
>Mar  4 14:24:58 rus01 postfix/smtpd[7481]: A0C1DC200A9:
>Mar  4 14:24:58 rus01 postfix/cleanup[7490]: A0C1DC200A9:
>message-id=<89683CF8C82A4F509FA3F905D1C696BA at daviddator>
>Mar  4 14:24:58 rus01 postfix/qmgr[6219]: A0C1DC200A9:
>from=<david.renstrom at gmail.com>, size=2449, nrcpt=1 (queue active) 
>Mar  4 14:24:58 rus01 postfix/pipe[7491]: A0C1DC200A9: to=<test at usnorr.se>,
>relay=dovecot, delay=0.14, delays=0.1/0.01/0/0.04, dsn=5.1.1, status=bounced
>(user unknown) 

The mail is being piped to the dovecot LDA instead of being delivered
by Postfix's 'local' delivery agent. Postfix's local would consult
/etc/mailman/aliases.db, but the dovecot LDA apparently does not.

There is probably something in Postfix's transport_maps that tells
Postfix to use the dovecot transport for this domain. You may need to
override this for list addresses. See the FAQ at
<http://wiki.list.org/x/ZoCj> for hints on how to do this.

Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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