Hi Luis,
At 05:22 PM 11-09-2017, Luis E. Munoz via mailop wrote:
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.
This is about mail submission (RFC 6409). 550 would be the closest
(SMTP) reply code for what the MSA is trying to communicate to the MUA [1].
Regards,
-sm
1. I assume that you meant "MAIL FROM"
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