Auto marking mail to nonexistent email address as spam

[Mark E. Donaldson]

-----Original Message-----
From: MailScanner mailing list [mailto:MAILSCANNER at JISCMAIL.AC.UK] On Behalf
Of Jan-Peter Koopmann
Sent: Saturday, May 29, 2004 4:08 AM
To: MAILSCANNER at JISCMAIL.AC.UK
Subject: Re: Auto marking mail to nonexistent email address as spam

On Saturday, May 29, 2004 10:55 AM David While wrote:

> I use milter-ahead (www.snert.com) in sendmail which does a look ahead
> to see if the user exists. If not it is rejected at my MS gateway by
> sendmail before MS ever gets it.

If I understand milter-ahead correctly this will not help you with Exchange.
Neither will recipient_verify in Exim. Exchange will accept all localparts
for valid domains. Microsoft's way of handling this is to send bounces.
There is no standard way to block mail to nonexistent users in any Exchange
version (including 2003).

Regards,
  JP

Exchange 2003 does have a "recipient filter" capability. When enabled
properly, exchange will block all mail to any recipient not listed in Active
Directory.




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