On Fri, Feb 20, 2026 at 5:01 PM Michael Wise <[email protected]>
wrote:

> It’s throttling.
> Slow down your deliveries.
>

The rate limit must be incredibly low, if that's the case.   We sent less
than 1500 messages to outlook.com mail servers all day on February 20th.

If it is a rate limit, then please share where the rate limit is
documented, so that I can set the throttle appropriately.  I can't keep
under a rate limit if I don't know what it is.

And if it's a rate limit, why are we getting 500 errors instead of 400?
That should be a temporary error.
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