Gary Dunn schrieb:

>Awhile back I read about a program that would refuse to accept mail from
>senders not on an approved list maintained by the recipient. I would
>like to experiment with such a program. I use POP3 to a vanilla local
>ISP (PIXI.NET, very nice, small, local Honolulu ISP, been with them for
>years). Currently I use Evolution (LM 8.1) to pick up the mail directly.
>I anticipate having to change to something like fetchmail, to provide a
>place -- a hook -- where the blocking can occur.
>
>The key to this filter's functionality is that I don't have to predict
>an expression to block unwanted mail. All mail is treated as unwanted
>until I say it can be delivered. When someone not on my list sends me a
>message, they receive an automatic reply with instructions how to get
>around the block. This is slightly annoying to real people, but
>effective against spammers who use bogus return addresses.
>
>What programs can be used for this?
>
>  
>

Check spamassassin (www.spamassassin.org), it is not exactly what you 
asked for but it works good - I use it and I love it. And there is 
Vipul's Razor at http://razor.sourceforge.net/

hth,

Jan


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