disabling SMTP
Suresh Ramasubramanian
suresh at outblaze.com
Sun Mar 28 14:08:57 UTC 2004
[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
--
srs (postmaster|suresh)@outblaze.com // gpg : EDEDEFB9
manager, outblaze.com security and antispam operations
More information about the NANOG
mailing list