On Tue, Jul 16, 2013 at 07:07:55AM -0700, HanniBaL wrote:
> This is why, I'm trying to setup a fallback transport for a virtual domain,
> under ZPanel/Postfix (Postfix version : 2.9.1), i.e when Postfix don't find
> a user locally it will relay mails to Google Apps server.
The Postfix fallback_transport is a feature of the local(8) delivery
agent. And user non-existence means not found in either the local
aliases(5) file or /etc/passwd user database.
It is far better to map each users mail destination explicitly, than
to rely on fallback mechanisms. Lazy is good, too lazy is trouble.
Use virtual_alias_maps to rewrite each user to <id>@gmail.example.com
(where example.com is your domain) and route <id>@gmail.example.com
to Google apps via a suitable border Postfix instance. This should
canonicalize the recipient address to a stable identifier that will
deliver it to the right Gmail mailbox.
--
Viktor.
