Question

I’ve got a stock Debian Etch system, using Exim4. The domains are mostly local but there are some that are remote. To handle the delivery of remote mail I use the Debian configuration file:

  /etc/exim4/hubbed_hosts 

This file lists the domain names, and remote MX machines to deliver to. For example:

  example.org:  mx.example.com   example.com:  mx2.example.com 

Looking at the exim4 configuration file I see that this used as follows:

hubbed_hosts:   debug_print = 'R: hubbed_hosts for $domain'   driver = manualroute   domains = '${if exists{CONFDIR/hubbed_hosts}\                    {partial-lsearch;CONFDIR/hubbed_hosts}\               fail}'   route_data = ${lookup{$domain}partial-lsearch{CONFDIR/hubbed_hosts}}   transport = remote_smtp 

The issue I have is that some of the hosts I’m using need to have their mail delivered to a non-standard port. Unfortunately the Debian hubbed_hosts file doesn’t work if I try to change it to include a port:

example.org: mx1.example.org:2525 example.com: 1.2.3.4.2525 

Is it possible to dynamically allow the port to be specified?

Answer 1

I was hoping for something a little more dynamic – and this solution works:

 port = ${if exists{/etc/exim4/ports.list}\               {${lookup{$domain}lsearch{/etc/exim4/ports.list}\               {$value}{25}}}{25}} 

Then a simple file may have a list of ports on a per-domain basis:

   example.org: 2525    example.com: 26