[Mimedefang] New spammer trick?

Kelson Vibber kelson at speed.net
Tue Nov 25 13:37:56 EST 2003

At 09:41 AM 11/25/2003, Joseph Brennan wrote:
>You'd be enforcing something unexpected, that mail with aol.com in the 
> From line may only be sent via AOL's service, etc.  You'd be prohibiting 
>them from sending mail with any other software with their aol.com address 
>in the From.

You'd also be blocking anything coming through forwarding addresses.  I was 
testing some code to do this just a few days ago (although I had it logging 
instead of blocking), and caught several legit messages that really did 
come from AOL, but were being sent to a forwarding address at another 
location.  By the time the messages got here, they were being sent from 
puzzle.pobox.com with an aol.com sender.

If you know that nobody on your server has an account somewhere else with a 
.forward file, it might be worth it.  Otherwise, some people may lose all 
mail from AOL, Yahoo, etc.

Kelson Vibber
SpeedGate Communications <www.speed.net> 

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