Domain used for spam - NDR responses

[Quentin Campbell]

>-----Original Message-----
>From: mailscanner-bounces at lists.mailscanner.info [mailto:mailscanner-
>bounces at lists.mailscanner.info] On Behalf Of Scott Silva
>Sent: 03 October 2007 00:28
>To: mailscanner at lists.mailscanner.info
>Subject: Re: Domain used for spam - NDR responses
>
>on 10/2/2007 4:06 PM Jeff Mills spake the following:
>> Hi all,
>> Just wondering if anyone has some magic solution for what I'm sure is
>> a common problem.
[snip]
>> Rgs,
>> Jeff
>Milter null is supposed to help, but I haven't used it.
>
>But you should be dropping non-existent users at the first point of
>entry to your system, either the mail server, or the gateway if you
>use one. The connections get dropped as soon as they give a
non-existent
>user address.

That is the obvious and common solution.

Do as Scott suggests for the domains over which you have control. If
your MTA is Sendmail you can use milter-ahead (same vendor as for
milter-null) for the domains to which you merely act as a gateway/relay.
This latter approach of course assumes that the recipient MTAs to which
you are relaying reject non-existent addresses as your own does.

If they don't that is not your problem! The recipient MTA has accepted
responsibility for the messages with invalid addresses in its domain(s)
that you relayed to it. The messages are no longer in your queues!

Quentin