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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