[ILUG] ESMTP weirdness with one of {cisco|adsl}

[Achim Dreyer]

On Fri, 6 Dec 2002, Ronan Waide wrote:

> I'm digging into a problem here that's making no sense. I've got a
> mail server sitting behind a Cisco which talks to the rest of the
> world via an ADSL line provided by eircom. At present, if I try using
> EHLO to any server anywhere, I get a 502 response. This obviously
> means I can't go pick up mail from my secondary MXs, because no EHLO
> -> no ETRN.
[..]
> So. Am I to arrive at the conclusion that Eircom are messing with my
> EHLO stream, or is this some new Cisco feature I should be aware of?
> And if the latter, how do I turn the damn thing off?

Hy,

Are you sure that the Cisco is not working as a semi-proxy for mail?
Cisco is not supporting EHLO. There had been some discussions on the 
firewall mailing lists about this.  Search for Cisco, PIX and EHLO..


Regards,
Achim Dreyer
--
A. Dreyer, Senior SysAdmin (UNIX&Network) / Internet Security Consultant