I had an interesting thought today, but it's a real strange one, so
follow along:

Most spam shows up with bad headers like the From: line saying
"[EMAIL PROTECTED]".  Is there any way for an MTA to reverse-VRFY
a sending account before allowing the communication to continue?  I
know a lot of mail systems disable VRFY, since it allows a spammer
to find out who is there, but that's pretty much dead anyway since a
spammer can just send e-mail to [EMAIL PROTECTED] through [EMAIL PROTECTED]
and filter out the bounces.  Given all the null e-mails on my yahoo.com
account, this is being done.

So back to the idea.  When "[EMAIL PROTECTED]" wants to 
deliver something to me, why can't the MTA hit the MX for mail.com
and VRFY that the account is valid?  If it's valid, it comes
through.  If not *wham* gets immediately flagged as spam and goes
to an alternate box or whatever.

Or can procmail do this?

-Mark




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