Clifford Gonsalves:
> Hello Again,
>
> The servers are 1 Exchange and 1 Zimbra.
>
> Can this work?
> 1: First server delivery via transport map.
> 2: Second delivery via address rewrite (recipient _bcc maps ) then
> transport map to the rewritten address.
> 3: At Zimbra rewrite address again and delivery to local mailbox.
>
> The solution is only required for incoming emails from the Internet.
You can use the Postfix virtual_alias_maps feature to deliver mail
for u...@example.com to u...@host1.example.com and u...@host2.example.com.
This of course requires that the Exchange servers can handle such
addresses.
The Postfix virtual_alias_maps lookups could even implemented with
LDAP which is supported in Active Directory.
However, one problem is that when a user reads and deletes email
on one Exchange server, the message still exists on the other server.
An untested alternative is to use a transport_maps entry that returns
smtp:host1.example.com, host2.example.com
(this requires Postfiux 3.5 or later) so that Postfix tries those
in order, and to rely on mailbox replication between trhe Exchange
servers.
Wietse
