[145850] in North American Network Operators' Group
Re: Outgoing SMTP Servers
daemon@ATHENA.MIT.EDU (=?utf-8?Q?Bj=C3=B8rn_Mork?=)
Tue Oct 25 08:45:20 2011
From: =?utf-8?Q?Bj=C3=B8rn_Mork?= <bjorn@mork.no>
To: Owen DeLong <owen@delong.com>
Date: Tue, 25 Oct 2011 14:43:56 +0200
In-Reply-To: <3070789B-ECE7-458F-B89C-4E2B39C265AA@delong.com> (Owen DeLong's
message of "Mon, 24 Oct 2011 21:37:11 -0700")
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Owen DeLong <owen@delong.com> writes:
> It's both unacceptable in my opinion and common. There are even those
> misguided souls that will tell you it is best practice, though general ag=
reement,
> even among them seems to be that only 25/tcp should be blocked and that
> 465 and 587 should not be blocked.
It is definitely considered best practice in some areas. See e.g.
http://translate.google.com/translate?hl=3Den&u=3Dhttp://ikt-norge.no/wp-co=
ntent/uploads/2010/10/bransjenorm-SPAM.pdf
(couldn't find an english original, but the google translation looks OK)
The document is signed by all major ISPs in Norway as well as the
Norwegian research and education network operator, so it must be
considered a local "best practice" whether you like it or not.
Note that only port 25/tcp is blocked and that some of the ISPs offer a
per-subscriber optout.
Eh, this was the Northern Aurope NOG, wasn't it?
Bj=C3=B8rn
