Loic Prylli <loic(_dot_)prylli(_at_)abbloi(_dot_)org> writes:
I really like c) because it really makes spf compatible with all the
current dialups-filtering/port25-blocking anti-spam techniques. That
would for instance seriously limit the possibility of thrown-away
domains used in combination with hijacked or misconfigured
dialups/DSL/cable machines. SPF is mainly about avoiding a forged
from, and if it complements current antispam techniques rather than
proposing to replace them, it would make things much easier (IMHO to
block outgoing port 25 by default for a machine is a good thing, even
if of course every ISP should provide the option not do to it for free
...).
In summary, what do you think about proposing the adoption of another
port for MUA->MTA communication?
There already is one. See the Message Submission RFC (2476).
http://www.faqs.org/rfcs/rfc2476.html
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