[gentoo-user] Re: Postfix to relay mail even if acting as primary MX host?

[Pandu Poluan <pandu@poluan.info>]

On Thu, Oct 13, 2011 at 17:11, Pandu Poluan <pandu@poluan.info> wrote:
> Okay, I'm still scratching my head here.
>
> Scenario: Having a Postfix server in the cloud to act as the primary
> MX, but actually forwarding the emails to my company's email server
> behind the firewall.
>
> For the purposes of my scenario, here are the relevant (but mangled) settings:
>
> *) Domain is "example.com"
> *) Postfix server is "mailer.example.com" with the IP 55.66.77.88
> *) Company email server is accessible via 11.22.33.44:5225
> *) Firewall only allows incoming traffic to 11.22.33.44:5225 from 55.66.77.88
> *) I want to set MX for "example.com" to "mailer.example.com"
>
> I saw the "relay_domains" and "relayhost" settings, oh good. But then
> I ran smack-drab to the following "NOTE":
>
> # NOTE: Postfix will not automatically forward mail for domains that
> # list this system as their primary or backup MX host. See the
> # permit_mx_backup restriction description in postconf(5).
>
> So, if I set "relay_domains = example.com" and "relayhost =
> [11.22.33.44]:5225", yet have "mailer.example.com" as the primary MX
> for the domain "example.com", the emails won't be relayed to
> 11.22.33.44:5225, right?
>
> Can anyone help me configure Postfix to actually do what I want, e.g.,
> to *still* relay emails destined to @example.com to the address
> 11.22.33.44:5225?
>

I found this:

http://www.postfix.org/STANDARD_CONFIGURATION_README.html#backup

is that the configuration I should use?

Rgds,
-- 
FdS Pandu E Poluan
~ IT Optimizer ~

 • LOPSA Member #15248
 • Blog : http://pepoluan.tumblr.com
 • Linked-In : http://id.linkedin.com/in/pepoluan