SPF. reverse lookups. It's the "How many half-baked ideas can we fit into a single thread?" contest, again.
Jonathan de Boyne Pollard
J.deBoynePollard at Tesco.NET
Wed Dec 1 12:42:33 UTC 2004
L> What am I missing?
You are missing years of discussion where it has been pointed out, time
and again, that reverse lookups aren't a security or a validation
mechanism, that reverse lookup relies upon attacker-supplied data, that
reverse lookups are not the inverses of forward lookups, and that
SMTP-based Internet mail is a store-and-forward system where any
particular SMTP Relay client is not necessarily the actual origin of a
SPF and reverse lookup validation have been discussed in a lot of fora
many times over a long time, and eventually most reasonable and
intelligent people reach the same conclusions. Google is your friend.
Search and read.
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