need help blocking emails to non-existent users

[Drew Marshall]

On Wed, 19 Dec 2007 22:33:46 +0000, Julian Field
<MailScanner at ecs.soton.ac.uk> wrote:
> Then use milter-ahead if you are using sendmail or Postfix, available
from
> http://www.milter.info/sendmail/milter-ahead/
> It will cost you € 90 euros for a site licence for it, but it's well 
> worth the small investment.

Agreed if you are running Sendmail. POstfix has this functionality built
it. Just use recipient_verification as one of your smtpd checks and you are
done.
> 
> This is a far more robust solution than trying to reliably read, parse 
> and process all the Active Directory entries, which may be out of date 
> on newly-created accounts, and require far more long-term maintenance 
> than my solution above, which you can just setup and leave alone.
> 
> Can someone add this to the wiki please?

I think you will find this is in the Postfix section already
http://wiki.mailscanner.info/doku.php?id=documentation:configuration:mta:postfix:how_to:reject_non_existent_users
(Watch for the wrapping)

Drew


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