[Pkg-exim4-users] Multiple ports and enforcing authentication on just the non-standard one.

[Andreas Metzler]

On 2006-07-16 Neil Briscoe <neil.briscoe at adelix.com> wrote:
> Flushed with success on getting the additional router working precisely 
> the way I wanted it - thanks to a couple of people's help here - what 
> I'm looking to do next is get our MTA listening on a non-standard port 
> as well as port 25.

Set
daemon_smtp_ports = 25:587

> Well, I know how to do that bit.

> I do need to go and read up the README.Debian file on authentication - I 
> know that gets a bit difficult.  What I need to know is whether the 
> relevant chapter in there will tell me how to enforce authentication on 
> the non-standard port - whilst not enforcing it on the standard SMTP port.

> Why do I want to do this?  Well, two of our senior management are on 
> Wanadoo UK who capture all port 25 traffic and force it through their 
> server - so no matter what the management put in their SMTP settings 
> (assuming standard port 25) it doesn't go through the server they 
> specify, but through Wanadoo's server.

> Secondly, it seems the Wanadoo UK servers have got themselves onto 
> Sorbs' DNSBL blacklist - which upsets at least two separate anti-spam 
> systems - including ours - I've had to add a couple of rules to get 
> around that.

> Be nice if I could offer them a solution whereby they could relay via us 
> - but I don't want the whole of Wanadoo able to do that - hence the need 
> for authentication on the non-standard port, but leave it turned off on 
> port 25.

I actually do not get why you want to explicitely disable SMTP AUTH on
port 25. This
auth_advertise_hosts = ${if eq{$interface_port}{587}{*}{}}
would probably do the trick.

cu andreas
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