When they start seeing the 4xx, they need to slow down. Aloha, Michael. -- Michael J Wise Microsoft Corporation| Spam Analysis "Your Spam Specimen Has Been Processed." Open a ticket for Hotmail<http://go.microsoft.com/fwlink/?LinkID=614866> ?
From: Matthew Pounsett <[email protected]> Sent: Friday, February 20, 2026 2:56 PM To: Michael Wise <[email protected]> Cc: [email protected] Subject: Re: [EXTERNAL] [mailop] Anyone from Outlook? S3150 block list mirage On Fri, Feb 20, 2026 at 5:52 PM Michael Wise <[email protected]<mailto:[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?
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