Personally, I think that's a phenomenally stupid approach. As long as you
can't show me an RFC that says you MUST or even SHOULD use SPF or DKIM,
you're breaking SMTP.
Due to the exponential increase of spam, we generally have to reject all
messages which are not secured by SPF or DKIM, and we know a lot of other
people who do the same (by the way, this has proven to be extremely
effective in our case). When our MTA encounters such a message, it
rejects it and returns a bounce message to the pretended sender,
notifying him about the problem.
--
Sebastian Hagedorn - Weyertal 121, Zimmer 2.02
Regionales Rechenzentrum (RRZK)
Universität zu Köln / Cologne University - Tel. +49-221-470-89578
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