ietf-mxcomp
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Re: Backward compatibility with deployed SPF records (and choice of domain)

2004-06-26 02:42:24

"Eric" == Eric A Hall <ehall(_at_)ehsco(_dot_)com> writes:

    Eric> underscore is illegal for hostnames. service names are not
    Eric> hostnames.

I think there was a concern that many hosted DNS services do not allow
underscore anywhere.  I'm sure this was discussed on the SPF list some
time ago, but I can't remember if the concern was substantiated...

         -roy