From: Victor Duchovni (no email)
Date: Mon Jan 24 2005 - 13:32:27 EST
On Mon, Jan 24, 2005 at 03:21:23PM -0200, Ricardo Pardini wrote:
> Hello,
>
> I'm running Postfix 2.1.4 and 2.1.5 (Debian sarge/sid) on two
> different boxes that serve as backup MXs for many domains. The main MX
> (also running Postfix 2.1.5) had port 25 recently firewalled by my ISP.
> Since then I added port 2525 to the main MX, using master.cf, and used
> transport_maps in the backup MX's to direct them to send mail via port
> 2525. Both backup MX's also use fallback_relay, since they serve other
> purposes (small LAN server).
> This seems to cause a mail loop when even port 2525 is unreachable.
> Postfix tries to deliver to port 2525 and fails; fallback_relay kicks in
> and sends it to my ISP, which tries to deliver to the main MX, fails,
> and tries the backup MX (from where the mail has just come), repeat,
> repeat, until someone detects the loop and bounces.
>
>
> backup MX servers main.cf:
>
> fallback_relay = smtp.myisp.example.com
> transport_maps = hash:/etc/postfix/transport
> relay_domains = /etc/postfix/backup_mx
Don't use a fallback relay when sending mail to your relay_domains.
master.cf:
relay unix ... smtp
-o fallback_relay=
make sure that all domains for which you accept mail from strangers
and then relay to remote machines use the "relay" transport.
-- Viktor. Disclaimer: off-list followups get on-list replies or get ignored. Please do not ignore the "Reply-To" header. To unsubscribe from the postfix-users list, visit http://www.postfix.org/lists.html or click the link below: <mailto:?body=unsubscribe%20postfix-users>
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