Alex van den Bogaerdt wrote on Sunday, January 14, 2007 1:47 PM -0600:
Erm, no, what I mean with "implicit 'a'" is the following:
"v=spf1 a ?all"
A host with an IP address that resolves to "mailhost.example.com" is
implicitly allowed to say "HELO mailhost.example.com". A host with
a different IP address is NOT forbidden to use the name by default
(in other words: ?all, not -all).
If I understand you correctly, you are suggesting that implicit "a"
means to imply "+a" for every SPF record. If so, it would then be
hard to say that a domain sends no mail since the implied "+a" in
turns it into
"v=spf1 +a -all"
In that case, you'd need to say
"v=spfX -a -all"
Just like with the implicit MX, there is often no host that has the
identical name as the domain _and_ is authorized to send mail.
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