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"Hallam-Baker, Phillip" <pbaker(_at_)verisign(_dot_)com> writes:
Maybe we should look at the type of behavior you might want for S/MIME. One
reason you might deploy S/MIME would be to address the roaming issue. So you
would want to say something like 'all mail from these addresses comes from
either this set of IP addresses or has an S/MIME signature.'
v=spf1 mx smime -all
But this SPF spec is misleading because most SPF clients will actually
see this as: "v=spf1 mx ?all"
If you use a modifier, things are clearer. If you say
"v=spf1 mx -all smime=_smime.%{p}", then it is clear to everyone that
the default will be -all if the special client doesn't recognize the
smime extention. Of, if you really want to return unknown in such
case, you would specify "?all" instead of "-all".
-wayne
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