[Mimedefang] blocking mail before getting to spamassassin

[Dennis Wynne]

1) Turn on the greet_pause function in sendmail - this will drop a fair 
number of spammers. You can bypass this for local or trusted boxes to avoid 
the delay.
2) Turn on needmailhelo - this will drop a few more
3) Use RBLs as was mentioned
4) If you have a finite number of users to service (as I do) then configure 
your system to only accept mail for these users and reject mail for any 
other user name at the RCPT time
5) Use greylist / relaydelay to make them resend the message before you do 
any other spam checks on it
6) Then do your other spam checks

Dennis


===== Original Message from mimedefang at lists.roaringpenguin.com at 2/15/06 
10:20 am
>Can someone give me some pointers on
>rejecting/dropping mail before it gets to
>spamassassin?  I'm running solaris 9, sendmail,
>mimedefang and spamassassin.  I'd like to block some
>messages at the sendmail level since that doesn't use
>much cpu/memory (I'd think most zombie's, ratware,
>spoofing can be stopped here).  Then within mimedefang
>if the email fails the network checks to reject it/by
>pass spamassassin testing (again trying to avoid using
>too much cpu/memory) and then and only then run the
>email through spamassassin.
>
>
>
>__________________________________________________
>Do You Yahoo!?
>Tired of spam?  Yahoo! Mail has the best spam protection around
>http://mail.yahoo.com
>_______________________________________________
>NOTE: If there is a disclaimer or other legal boilerplate in the above
>message, it is NULL AND VOID.  You may ignore it.
>
>Visit http://www.mimedefang.org and http://www.roaringpenguin.com
>MIMEDefang mailing list MIMEDefang at lists.roaringpenguin.com
>http://lists.roaringpenguin.com/mailman/listinfo/mimedefang