S3150 and S3140 are both volume (emails per hour) throttling. 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: mailop <[email protected]> On Behalf Of Damien Ransome via mailop Sent: Monday, July 28, 2025 8:34 AM To: mailop <[email protected]> Subject: [EXTERNAL] Re: [mailop] Microsoft blacklistings Unsure if we're talking about the same thing here, but we have a recurring nightmare with S3150 listings across a number of servers. The reason for the listings always remains a mystery (these are not bulk mailers, don't appear on any public blocklists, and show fine in SNDS). MS delist upon request, but then re-list again within a few weeks - repeat ad infinitum... [https://static.layershift.com/logos/layershift/stacked_left-align_120x112.png]<https://www.layershift.com/> Registered office: Layershift Limited, 83 Ducie Street, Manchester, M1 2JQ, United Kingdom Layershift Limited is a company registered in England and Wales (6036217).
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