On Fri, 20 Feb 2026, Matthew Pounsett via mailop wrote:
On Fri, Feb 20, 2026 at 5:52 PM Michael Wise <[email protected]>
wrote:
It’s IP specific, and is dynamically assigned.
Then 5xx errors _really_ make no sense. If a sender can't know in advance
what their rate limit is, how are they supposed to throttle other than to
re-queue and retry later?
Maybe the 4xx error earlier gives some clue ?
--
Andrew C. Aitchison Kendal, UK
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