[Mimedefang] Validate forged local sender

Stephen Carr sgcarr at civeng.adelaide.edu.au
Wed Nov 26 06:40:02 EST 2008

Dear list

I am trying to block spams that have the sender forged as a non existent
user in our domain but the recipient is a valid email address.

Sendmail is configured with LUSER_RELAY that has a list valid users -
returns "nouser User unknown" if user does not exist.

I have searched the web with no success.

Any pointers will be appreciated.

Stephen Carr

Current config

Stephen Carr
Computing Officer
School of Civil and Environmental Engineering
The University of Adelaide
Tel +618-8303-4313
Fax +618-8303-4359
Email sgcarr at civeng.adelaide.edu.au

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