[12619] in North American Network Operators' Group
Re: Filter on postoffice.reston.mci.net
daemon@ATHENA.MIT.EDU (Dean Gaudet)
Wed Sep 24 21:34:55 1997
Date: Wed, 24 Sep 1997 18:29:08 -0700 (PDT)
From: Dean Gaudet <dgaudet-list-nanog@arctic.org>
To: Kevin Houle <kevin@netins.net>
cc: nanog@merit.edu
In-Reply-To: <199709241918.OAA07679@ins6.netins.net>
FWIW I too see this when attempting from one address, but not from
another. Both addresses are in MCI customer-owned ip blocks. Both
addresses have correct double-reverse lookups. It's more than just a bit
annoying ... especially when I receive mail from MCI's noc and cannot
reply to it unless I go through hoops to route it through another box.
Dean
On Wed, 24 Sep 1997, Kevin Houle wrote:
> On Wed, 24 Sep 1997 14:45:01 -0400 (EDT)
> Jared Mauch <jared@puck.nether.net> wrote:
>
> > Kevin.. it works if you give the proper machine name in the HELO
>
> MCI's iNOC pretty much confirmed there was a filter in place,
> as did the systems person I finally reached thanks to some
> key responses from this list. Probably a spam relay block of
> some kind. The '550 Access denied' reponse is that they use
> in their SMTP filters. postoffice.reston.mci.net was down for
> two hours and counting when I got them on the phone, so with
> local MCI users not being able to send mail, I was not a high
> priority :)
>
> At any rate, the 'HELO netins.net' statement is a result of
> host masquerading (DMnetins.net). Same thing happens with a
> FQDN :
>
> 220 postoffice.Reston.mci.net ESMTP Sendmail 8.8.5/8.8.5; Wed, 24 Sep 1997 15:16
> :25 -0400 (EDT)
> HELO worf.netins.net
> 250 postoffice.Reston.mci.net Hello kevin@worf.netins.net [167.142.225.4], pleas
> ed to meet you
> MAIL FROM:<kevin@netins.net>
> 550 Access denied
>
> Kevin
>
