[107528] in North American Network Operators' Group
Re: ingress SMTP
daemon@ATHENA.MIT.EDU (Mikael Abrahamsson)
Fri Sep 5 04:35:22 2008
Date: Fri, 5 Sep 2008 10:35:15 +0200 (CEST)
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: nanog@nanog.org
In-Reply-To: <200809050921.17516.simonw@zynet.net>
Errors-To: nanog-bounces@nanog.org
On Fri, 5 Sep 2008, Simon Waters wrote:
> If the ISP blocks port 25, then the ISP is taking responsibility for
> delivering all email sent by a user, and they have to start applying rate
> limits.
MUAs should stop sending email via 25 and use 587 or equivalent instead.
There is little actual reason why someone should be able to send TCP/25
SMTP email from a residential connection when most software support
authenticated TCP/587 submits.
We don't allow most of our residential customer base to speak SMTP TCP/25
to anywhere at all (and we have millions of them). Wish more ISPs would do
the same.
--
Mikael Abrahamsson email: swmike@swm.pp.se
