tumgreyspf - an external policy checker for the postfix mail server
Tumgreyspf can optionally greylist and/or use spfquery to check SPF records to
determine if email should be accepted by your server.
SPF is information published by the domain owner about what systems may
legitimately send e-mail for the domain. Greylisting takes advantage of spam
and viruses that do not follow the RFCs and retry deliveries on temporary
failure. We use these checks as part of our mail system and have seen several
orders of magnitude reduction in spam, lower system load, and few problems
with legitimate mail getting blocked.
Tumgreyspf uses the file-system as it's database, no additional database is
required to use it.
This man page is a place holder for whoever wants to write a doc to this. Feel
free to send it to the upstream Sean Reifschneider <firstname.lastname@example.org> or
to me, the Debian maintainer, Thomas Goirand <email@example.com>.