[OT] postfix and multiple domains help

[Mike Burger]

> I know this is off-topic, but I've run out of ideas (and ways to Google
> it), so I'm begging for help here.  I've got a postfix mail server on
> RHEL 4 that serves up 4 or 5 virtual mail domains.  That in itself was
> really easy.
>
> My problem stems from the need to setup mail aliases for those domains
> to existing virtual accounts.  I.e.:
>
> user at domain1.org --virtual mail box
> user2 at domain1.org is an alias of user1 at domain.org.
>
> My problem is I cannot find any documentation that clearly explains how
> to do this, if it's actually possible.  It's bound to be something
> simple, but I'm missing it.
>
> Anybody had to do this before?

Actually, it's not that hard.

What I did was create a file, /etc/postfix/virtusertable, formatted like so:

domain1.org Descriptive Name of domain 1
user1 at domain1.org localusername1
user2 at domain1.org localusername2
@domain1.org localusernameX (this domain user wished a catch all)

domain2.org Descriptive Name of domain 2
user1 at domain2.org localusername

etc, etc.

Next, run "postmap has:/etc/postfix/virtusertable" to create the hash db.

Next, add "virtual_maps = hash:/etc/postfix/virtusertable" to your
/etc/postfix/main.cf.

Also, make sure you have a file like "/etc/postfix/virtual_domains"
containing the virtual domains, and then add the path to that file in
main.cf as a line looking like:

mydestination = /etc/postfix/virtual_domains.

Alternately, you could list the virtual domains directly on the
"mydestination" line, but I like to keep my main.cf as clean as possible.

Now, "service postfix reload" or "/etc/init.d/postfix reload" to reload
the configuration and bring in the virtual user table and the list of
virtual domains, and voila!!!
-- 
Mike Burger
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