Your MTA should be doing this job and not SA IMHO.

QQQQ

----- Original Message ----- 
From: "Rick Roe" <[EMAIL PROTECTED]>
To: <users@spamassassin.apache.org>
Sent: Wednesday, August 30, 2006 9:41 PM
Subject: catching fake usernames?


|I get a lot of spam whose From addresses are users that don't exist on  
| my system (random names like [EMAIL PROTECTED], [EMAIL PROTECTED], etc).  
| I recently set up a scheme to manually blacklist all From addresses on  
| my domains and un-blacklist the fifty or so "real" addresses mail can  
| legitimately come from (the system aliases like postmaster, daemon,  
| and so forth, and a small handful of real users each with a handful of  
| aliases), using blacklist_from and unblacklist_from in the local  
| config file.
| 
| This is a rather fragile system, though -- anytime I go to add any new  
| users or aliases, I'll have to edit my local.cf files to match. My  
| user population is rather static, so it's not a big deal, but it seems  
| like there should be a simpler, more automatic way to do this. Am I  
| missing something?
| 
|

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