My son had the exact same problem at his site and it's a tough one to call.
Configure your SMTP mail gateway to only accept mail that is destine for
your site and DROP everything else. In other words don't send an
'undeliverable' message to the sender. That stops someone that is trying to
use your mail to distribute their 'spam'.
However, it doesn't resolve the problem of mail that is misdirected to your
site. We have a 'junk' mail box in exchange with a rule that deletes any
mail that it receives. When someone leaves the company, we monitor their
incoming mail for 30 days and then we delete their mailbox and assign their
alias to the 'junk' account. From that point on any mail addressed to them
is received and deleted automatically. We clean up the aliases a couple of
times a year.
I suspect you could do something like this with sendmail too but I've never
tried it.
> -----Original Message-----
> From: Tim Stearns [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, November 04, 1999 6:34 PM
> To: '[EMAIL PROTECTED]'
> Cc: '[EMAIL PROTECTED]'; '[EMAIL PROTECTED]'
> Subject: How could I stop this kind of email?
>
> Hello - Our Exchange server is set to refuse to relay mail, but messages
> to recipients like
> the following regularly show up in the IMC Outgoing queue.
>
> <[EMAIL PROTECTED]>
>
> Does this irritating kind of bounce have a name? It's an "Undeliverable"
> to an incorrect
> return address. Could someone suggest a way to stop it or a site which
> has documents
> about doing so? I'm CC'ing the postmasters at render.com and
> downtown.com, the
> nameservers.
>
> From: System Administrator <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: Undeliverable: $50,000 in 90 days!!!!!
> Date: Thu, 4 Nov 1999 18:10:58 -0800
>
> Your message
>
> To: [EMAIL PROTECTED]
> Subject: $50,000 in 90 days!!!!!
> Sent: Thu, 4 Nov 1999 09:34:32 -0800
>
> did not reach the following recipient(s):
>
> [EMAIL PROTECTED] on Thu, 4 Nov 1999 18:10:55 -0800
> Unable to deliver the message due to a communications failure
> MSEXCH:IMS: Unknown Recipient
>
>
>
> -
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