On Wed, Apr 29, 2015 at 11:18:47AM +1100, J?r?me Alet wrote:
> For a few users only, we are planning to have, in addition to
> the setup above :
>
> Internet ==> MX ==> Server1 ==> Backend2
> Internet <== Server1 <== Backend2
>
> Where Backend2 is a Debian Wheezy machine hosting Postfix 2.9.6
>
> So we've modified our transports on Server1 to read something like :
>
> example.com relay:[Backend1-IP]
> [email protected] relay:[Backend2-IP]
> ...
Replace this (on Server1) with a rewriting configuration:
virtual:
[email protected] [email protected]
transport:
example.com relay:[backend1.example.com]
backend1.example.com relay
backend2.example.com relay
> In particular we want that messages from "[email protected]" (migrated
> to Backend2) to "[email protected]" (not migrated yet from Backend1 to
> Backend2) still pass through Server1. In fact, even a message from
> "[email protected]" to "[email protected]" should still pass through
> Server1.
>
> Unfortunately Postfix on Backend2 tries to deliver such messages
> locally, instead of forwarding them to Server1 first.
On "Backend2":
main.cf:
mydomain = example.com
myorigin = $mydomain
relayhost = [server1.example.com]
# Uncomment one of the below. Set the other to what remains
# after removing $myhostname:
#
# mydestination = $myhostname, localhost, localhost.$mydomain
# virtual_mailbox_domains = $myhostname
Mail to the domain goes to the smarthost, and from there dispatched
to the right account (via rewriting).
> On Backend2 mydestination is defined as :
>
> mydestination = example.com, backend2.example.com,
> localhost.localdomain, localhost
Looks like you're using local(8) delivery, I'd like to strongly
urge you to go with virtual(8) (or similar, e.g. Dovecot IMAP)
delivery for a new installation. Avoid local(8) mailboxes. Use
local(8) only for mailing lists large enough to need owner-aliases.
--
Viktor.
