On Wed, 7 Oct 1998, Kerry Hoath wrote:
> Spam is beeing forged from users at our system, who no longer exist to AOL
> addresses who do not exist.
> The message comes from xyzzy@??? (non-existant user) to
> invaliduser@???.
> AOL correctly bounces the message that comes back to us.
> The problem is that our machine accepts the mail and then aparently bounces
> the message back to aol.
Is AOL not sending their bounces with an empty sender address, that is
MAIL FROM:<>
as the RFCs mandate? If they are doing that, Exim should never attempt
to send back a further bounce from your machine.
> What we want to do is reject messages to unknown users on our machine either
> at smtp time, or if this is not possible, we want to drop messages from
> <> to an invalid user into the bit bucket.
Turn on receiver_verify if you want to reject mail to non-users at SMTP
time. Adjust the settings of ignore_errmsg_errors and/or
ignore_errmsg_errors_after if you want to do special things to bounce
messages that cannot be delivered.
--
Philip Hazel University of Cambridge Computing Service,
ph10@??? Cambridge, England. Phone: +44 1223 334714.
--
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http://www.exim.org/ ***
