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[spf-discuss] <toplabel> (was: Empty MX name)

2005-12-29 23:25:47
Julian Mehnle wrote:
 
why do we forbid "a:1.2.3.4"?  It's a valid FQDN, after all.

It's not, see STD 3 (1123) 2.1 "host names and numbers".  SPF
is less restrictive using <toplabel> as specified in 2396, and
even the most liberal 3696 won't allow a digit-only <toplabel>.

Harald checked this with IANA, IAB, IESG, and the namedroppers
for the purposes of USEFOR, see also the thread ending with
<http://mid.gmane.org/43A07EC8(_dot_)387C(_at_)xyzzy(_dot_)claranet(_dot_)de> 
and
<http://mid.gmane.org/439EE3D1(_dot_)5184(_at_)xyzzy(_dot_)claranet(_dot_)de> 
after
<http://permalink.gmane.org/gmane.ietf.usenet.format/30246>.

                            Bye, Frank


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