Postfix

postfix sets the hostname of clients without a reverse dns mapping to
‘unknown’ — maybe milter-greylist should do the same:

postfix/smtpd[15288]: connect from unknown[42.34.51.23]

milter-greylist just takes what it gets and that's often:

milter-greylist: (unknown id): addr [42.34.51.23][42.34.51.23] (...)

Patch is attached. Once applied, clients without a reverse dns mapping
will trigger the SpamAssassin RDNS_NONE test.

Postfix/SpamAssassin patch

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