One little-known DKIM fact is that one does not need a different
DNS record per d= domain. One strategically-chosen wild-card under
_domainkey.example.com suffices (e.g. one per sub-organization).
Not really. The part to the left of _domainkey is the selector, so you
can wildcard selectors (which I do, see this message), but not domains.
What you want is a DNS record for sel._domainkey.*.example.com, but don't
suggest that unless you want to open a famous can of worms that have big
bloody fangs.
Regards,
John Levine, johnl(_at_)iecc(_dot_)com, Primary Perpetrator of "The Internet
for Dummies",
Please consider the environment before reading this e-mail. http://jl.ly
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