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Tumgreyspf, an external policy checker for the postfix mail server. It can
optionally greylist and/or use spfquery to check SPF records to determine if
email should be accepted by your server.
Because of its design, legitimate e-mail is never trapped or rejected. Only
spam and viruses are caught. Since adding it to our mail server (which also uses
Spam Assassin, ClamAV, and an outsourced anti-spam system), our spam level has
dropped by an order of magnitude.
It uses the file-system as its database, no additional database is required to
use it.
WWW: http://www.tummy.com/software/tumgreyspf/
WWW: https://github.com/linsomniac/tumgreyspf
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