Jim Fenton wrote:
- My largest customers will not deploy DKIM verification if it
requires making a DNS query (or two) for every single non-signed
email that they receive. Even if it makes no real-world difference,
some people just won't do it.
I don't understand this. Many people routinely do reverse DNS lookups
on the IP address from which messages are received, SPF checks (which
can be several lookups), and so forth. Why the sensitivity to
additional, potentially well-cached lookups?
That's the difference between trying to tell people what is best for
them, versus listening to what they are comfortable with.
A MUST should be used when the thing being referred to is required for
the functionality to be meaningful. If it remain meaningful in spite of
exceptions, then a MAY is probably acceptable.
d/
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net
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