How to Filter junk by valid accounts

[Michael Baird]

On Mon, 2006-10-16 at 08:59 -0500, Carr, Daryl B. wrote:
> Hello,
> 
> What is the best way to filter email addresses as "valid" with sendmail.
> We have recently experienced a large increase in junk email resulting in
> the mqueue.in becoming very large (>400,000).
> 
> I have investigated LDAP, NIS, lists of names, etc.
> 
> Please point me in the best direction.
> 
> Thank you!

This must be somesort of mail gateway that forwards to an internal mail
server? You are looking to do recipient address verification. If this is
a case, probably your best bet is a milter to call your internal servers
and verify the recipients. I'm using this milter with success
http://smfs.sourceforge.net/smf-sav.html, but am not using the RAV
feature, which is apparently what you are looking for.

Regards
Michael Baird