Over the years I've seen rate limiting responses as 421 and 451 (with
the first being the most frequent). Is there a consensus in what the
correct code should be?
I'm going through RFC-5821 and none of the codes mentioned there seem to
be a perfect match to "hitting a rate limit for an authenticated user"
in my submission servers.
Given the above, I'm leaning towards using 421, returned after each and
every MAIL TO command.
Thanks in advance.
-lem
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