Re: disabling SMTP

[Suresh Ramasubramanian <suresh () outblaze com>]

[3/28/2004 7:29 PM]  Rob Nelson :

> Could you elaborate on this? I use PIX firewalls all over the place and 
> don't seem to have a problem with SMTP or ESMTP.

Check whether "smtp fixup" is enabled - and if it is, disable it using

# no fixup protocol smtp 25

Test the results (from an outside host, using netcat / telnet to port 
25) to see for yourself.

Briefly, a pix doing "smtp fixup" -

* Munges the smtp banner entirely with ***** (that breaks an rfc or two)

* Disables ESMTP (so EHLO will not be accepted)

* Munges several replies returned by the mailserver, turning them to XXX

        srs

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srs (postmaster|suresh)@outblaze.com // gpg : EDEDEFB9
manager, outblaze.com security and antispam operations