[156062] in North American Network Operators' Group
Re: The End-To-End Internet (was Re: Blocking MX query)
daemon@ATHENA.MIT.EDU (Sean Harlow)
Wed Sep 5 11:52:53 2012
From: Sean Harlow <sean@seanharlow.info>
In-Reply-To: <CAL_y8+afCFp_78q_EV4Xv8WRKQ-CJxJfgObz23K-b-xuHtVDhA@mail.gmail.com>
Date: Wed, 5 Sep 2012 11:51:54 -0400
To: Greg Ihnen <os10rules@gmail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Sep 5, 2012, at 11:46, Greg Ihnen wrote:
> But as someone pointed out further back on this thread people who want =
to
> have their mail servers available to people who are on the other side =
of
> port 25 filtering just use the alternate ports. So then what does =
filtering
> port 25 accomplish?
The alternate port 587 is for users of that mail server to send mail =
through it, presumably authenticated, not for receipt of random mail =
from the internet. This allows those users to relay email through their =
server unaffected while behind a port 25 block. Configuring it to =
accept all messages on that port would defeat the purpose.
---
Sean Harlow
sean@seanharlow.info=
