Re: Appending domain to a virtual mailbox lookup

From: Magnus Bäck (magnusdsek.lth.se)
Date: Thu Sep 01 2005 - 11:26:07 CDT

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On Thursday, September 01, 2005 at 17:20 CEST,
     Etienne Goyer <etienne.goyervideotron.ca> wrote:

> I am installing Postfix and Cyrus imapd to serve virtual mail domain.
> I am using OpenLDAP as an authentication source and lookup table for
> Postfix.
>
> For Cyrus imapd virtual domain support, I need to deliver via LMTP to
> mailboxdomain. I have configured Postfix to lookup the destination
> mailbox as such :
>
> main.cf:
> virtual_transport = lmtp:unix:/var/lib/imap/socket/lmtp
> virtual_mailbox_domains = example.com, test.com
> virtual_mailbox_maps = ldap:/etc/postfix/ldap-virtual-mailbox.cf
> virtual_alias_maps = ldap:/etc/postfix/ldap-virtual-mailbox.cf
>
> ldap-virtual-mailbox.cf:
> search_base = o=Something
> query_filter = mail=%s
> result_attribute = uid
>
> The uid attribute in LDAP in unqualified, ie it's "egoyer", not
> "egoyertest.com". For correct delivery via LMTP, I would need to
> have the domain the mail was originally destined to appended to the
> uid. As it is, I can see that the LMTP transport try to deliver mail
> to uidmyhostname, but I would like it to deliver to uiddomain.

Unqualified addresses are qualified with myorigin, which in your
case apparently happens to be equal to myhostname. You can use the
result_filter parameter (see ldap_table(5)) to modify the returned
string (uid in this case),

   result_filter = %sexample.com

but the string needs to be fixed at example.com or whatever domain,
i.e. you cannot say "append the same domain as the lookup key".

> Exemple : mail received for etienne.goyertest.com, LDAP search return
> "egoyer" (the uid attribute), mail delivered to egoyertest.com via LMTP.
>
> Is this possible ?

Nope.

> Would there be a better way of achieving the same result ?

Storing each user's canonical email address together with the rest of
the user's data seems like the natural solution, or making sure that the
canonical address can easily be derived from the data that is stored..

--
Magnus Bäck
magnusdsek.lth.se

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