Trix wrote:
> I don't want to highjack this thread, but I have a similar quandary in
> regards to Exchange servers. We have 9 Exch servers, and for both
> historical and practical reasons (not wanting to support 2 extra Exch
> bridgehead boxes), we would like Postfix to deliver to users homed on
> each server individually.
>
> Naturally, all the users have the same @example.com address. Their
> accounts are located on exch1.domain.example.com,
> exch2.domain.example.com etc. The Postfix server will be living in the
> example.com TLD. The user accounts do NOT include an SMTP address of
> the form "user@exch1.domain.example.com".
>
> I have no problems with extracting all the users' SMTP addresses, their
> usernames and their home MDB servers from the AD via Perl and SCPing it
> to the Postfix server in whatever format and number of maps that would
> be appropriate.
>
> I am guessing that it's a combination of virtual mailbox domains and
> transport maps, but I don't know how to glue it together, if indeed,
> it's possible. Multiple non-exchange servers in other subdomains are
> similarly affected.
>
> Other than LDAP lookups, I assume it's a similar problem to the
> original post. If not, my apologies, and I'll start a new thread.

Your scenario sounds similar to the original posting.

The easiest thing from an ongoing maintenance standpoint is to have the
email address info located in the LDAP directory. Typically the external
email address (user@example.com) is in the "mail" attribute, and
the hidden internal routing (user@exch1.example.com) is in the
"mailRoutingAddress" attribute.

Postfix is then configured to perform an LDAP query ala virtual_alias_maps.

It could also be done using a "transport" map. The left hand side is the
external mail address, and the righthand side is an LDAP attribute pointing
to the exchange server to send it to.

--
Greg