North American Network Operators Group
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Re: Reverse DNS and SMTP

  • From: David Charlap
  • Date: Thu Feb 28 17:09:12 2002 
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