ask at SMTP time

Hi,

Ask works fine to filter spam out. But it does not decrease amount of 
spam, because smtp accepts spam and spammers. Amount of spam is 
increasing all the time. Only way to decrease spam is reject spam at 
smtp time. Ask can be used to make spammers life hard!

Look for instance Spamassiing at smtp time, < URL: 
http://marc.merlins.org/linux/exim/sa.html >

Have anybody thougth how ask would work with sendmail at smtp-time?
1) when sender is in the white list, accept mail, that is no change in 
sendmail procedure
2) when sender is not in the white list - that is new sender, potential 
spammer - then sendmail returns status "450: mailbox unavailable untill 
sender has confirmed his/her return address", sendmail rejects mail and 
ask sends confirmation to the sender.

Now real senders can find out immediately that they must confirm their 
email-address and it is very easy to do wright a way. Real sender can 
resend thair mail in same session after confirmation is done.

Spammers forge their return address and they can't confirm. Because 
spammer's smtp thinks that recipients address does not work, recipient 
won't get any spam from that spammer any more. World is saved, thanks of 
ask!

Folks, what you think of the idea? Ask works much better at smtp time 
than SA. How hard this would be to configure and test?

BR, Reijo Korhonen





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