SPF-aware greylisting filter for the OpenSMTPD daemon
This filter implements greylisting, allowing OpenSMTPD to temporarily
reject sessions of clients it has not seen before. Unlike many
implementations, this one is SPF-aware so it will properly handle
greylisting for domains doing relaying through multiple MX, as long as
they publish a valid SPF record.

The filter currently supports:

* IPv4 and IPv6 address greylisting
* SPF greylisting
* startup whitelisting of IP and domains
* automatically renewed whitelisting

Maintainer: The OpenBSD ports mailing-list <ports@openbsd.org>

WWW: https://github.com/poolpOrg/filter-spfgreylist
