[ale] Spam blocker for Postfix

[ppolstra at gmail.com (Philip Polstra)]

Is anyone aware of a plugin for Postfix that would allow me to set up
something like Earthlink's Spamblocker on my mail server?  If you don't know
how this works, it will send anyone who isn't on your list an e-mail asking
them to go to a website to be added to your list.  Any questionable mail is
sent to a suspect folder.  I don't need the website part, but it would be
nice to have something similar.
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