[112358] in North American Network Operators' Group
Re: Yahoo and their mail filters..
daemon@ATHENA.MIT.EDU (Suresh Ramasubramanian)
Tue Feb 24 22:59:12 2009
In-Reply-To: <A675477406954F54B6B2F12AB30238B3@dredster>
Date: Wed, 25 Feb 2009 09:29:00 +0530
From: Suresh Ramasubramanian <ops.lists@gmail.com>
To: Micheal Patterson <micheal@spmedicalgroup.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
On Wed, Feb 25, 2009 at 9:23 AM, Micheal Patterson
<micheal@spmedicalgroup.com> wrote:
>
> SPF records aren't being recognized, I've been running them for some time
> now so it would seem that they're not honoring them.
>
Christ .. Yahoo did say "complaints". And it can take a very low
level of complaints before a block goes into place - especially for
low volume (corporate etc) mailservers.
Feedback loops are one cure, and another cure is keeping complaint volumes down.
* Do you have an unfiltered NAT gateway pointed to the same IP as your
corporate MTA?
* Do you have any large spam sources in close proximity to you? Like
you are colo'd on a /28 and someone else has a /27 or /26 in the same
/24 that's emitting tons of spam (assuming colo). Or you have your
mailserver hosted on a dsl pool (even a business class dsl pool) in
which case your server is an island of valid mail in a large swamp of
virus traffic
* Do you have a marketing department that might be slightly overactive?
etc etc.
srs
