spf-discuss
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RE: Why not just use S/MIME or GPG signatures?

2003-10-12 06:46:27
Could we all agree using your home or roaming computer to talk directly
to any SMTP destination in the world is still a legitimate and
sometimes
useful thing, and is perfectly compatible with any SPF filtering scheme
[ IF you have your own domain ]

I disagree that it's compatible with spf.  Most isp's and
corporate networks filter outbound traffic on tcp/25.


The fact that ISPs are filtering outbound traffic on tcp/25 cannot be
blamed on spf. On the contrary if spf was in wide use, ISPs would have
one less reason to do this filtering.

Loic

I don't blame the actions of ISPs on spf.  Nobody's using spf.  How could it
be spf's fault.

But ISPs do in fact use port filtering.  And that's a problem for SPF.

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