[71167] in North American Network Operators' Group
Re: Charter blocking Port 25
daemon@ATHENA.MIT.EDU (Todd Vierling)
Thu Jun 10 11:41:12 2004
Date: Thu, 10 Jun 2004 11:39:20 -0400 (EDT)
From: Todd Vierling <tv@duh.org>
To: Jeroen Massar <jeroen@unfix.org>
Cc: matthew zeier <mrz@velvet.org>, nanog@merit.edu
In-Reply-To: <1086881195.21261.220.camel@segesta.zurich.ibm.com>
Errors-To: owner-nanog-outgoing@merit.edu
On Thu, 10 Jun 2004, Jeroen Massar wrote:
: > That's why port 587 was invented. It's the MSA (mail *submission* agent)
: > port, intended only for initial injection of mail into the SMTP delivery
: > network. Learn it, believe it, use it. 8-)
:
: Mail *SPAM* Agent? ;)
Port 587 should always be authenticated. If it isn't, that's a
misconfiguration.
(Of course, those of us on SPAM-L have even seen bots successfully perform
SMTP AUTH, but that's certainly in the minority. Port-25 blocking for
dynamic/residential ranges is still considered good form, as it does cut
down significantly on the level of unauthenticated wormspew.)
--
-- Todd Vierling <tv@duh.org> <tv@pobox.com>
