[45935] in North American Network Operators' Group
Re: Reverse DNS and SMTP
daemon@ATHENA.MIT.EDU (David Charlap)
Thu Feb 28 17:07:18 2002
Message-ID: <3C7EA9CC.1D8985F6@marconi.com>
Date: Thu, 28 Feb 2002 17:06:04 -0500
From: David Charlap <David.Charlap@marconi.com>
MIME-Version: 1.0
To: nanog@merit.edu
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Errors-To: owner-nanog-outgoing@merit.edu
Jared Mauch wrote:
>
> What I do is format my smtp headers such that a very simple
> regex can find mail with no reverse dns and dump it in a spam folder.
> I find this catches a lot of the messages.
If your server is using a heuristic that has the potential of offending
your customers, you can make the blocking optional.
More specifically, respond to the "spam detected" condition by writing a
header that customers can check for. Once that header's in place, a
customer can configure his mail client to accept, delete, or spam-folder
the message. If a client wants these kinds of messages to be deleted on
the server, that may not be too hard to do either, once the header is
written.
-- David
