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Sanity check

2005-03-04 07:59:22
My understanding is that mx mechanism's shouldn't include IP
addresses:

1.  Since MX names must be domain names anyway, and
2.  since in the context of spf, it doesn't make sense for IP's
    to be listed under "mx:" as opposed to "ip4:" or "ip6", and
3.  since the spec does refer to the right-hand-side being
    a domain-spec.

Is this correct?

The reason I ask is because of:

    $ host -t txt advanta.com
    advanta.com text "v=spf1 mx ptr mx:12.40.127.100 mx:12.40.127.108 ~all"

Given that the two ip's listed are their mx hosts, it looks like they
could just as well use "v=spf1 mx ptr ~all"
or even "v=spf1 ip4:12.40.127.100 ip4:12.40.127.108 ptr ~all".

Just wanted a sanity check first before I contacted them.

-- 
Mark Shewmaker
mark(_at_)primefactor(_dot_)com


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