>> In one support case, gigantic isp to remain nameless, the addition of 
>> new TXT-based protocol support now caused "wildcard conflicts" between 
>> SPF and DKIM.

Since DKIM uses prefixed names, this is not a problem on any actual
deployment of DKIM.  

It's true, you can't do _domainkey.*.example.com, but this is a well
known limitation on prefixed names at least since they were invented
for SRV records.

R's,
John
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