Is it a shared IP? If not, raise an escalation thru the OutLook Consumer portal.
Also, if the rep has become bad enough, no amount of traffic might be allowed. These are issues you'll have to take up with the front line team. 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: Damien Ransome <[email protected]> Sent: Monday, October 27, 2025 10:48 AM To: Michael Wise <[email protected]> Cc: Thomas Scott <[email protected]>; [email protected] Subject: Re: [mailop] [EXTERNAL] Microsoft contact (S3150 blocklist issue) You don't often get email from [email protected]<mailto:[email protected]>. Learn why this is important<https://aka.ms/LearnAboutSenderIdentification> Hi Michael, That and S3140 indicates that your traffic is being throttled. You could try slowing down your delivery rate to not trip the breakers. That's all I can say. As an example, we had a customer with a tiny amount of outbound email headed to Microsoft controlled mail servers (all emails sent from their own server, with their own IP - i.e. these are the only emails sent to Microsoft from that IP in the time period): Oct 7 17:47:59 Oct 8 15:53:18 Oct 14 06:01:00 Oct 17 14:42:43 Oct 20 17:05:27 Oct 21 13:05:12 Oct 21 15:06:11 Oct 22 13:46:35 Oct 23 20:15:57 Oct 24 17:18:24 Please contact your Internet service provider since part of their network is on our block list (S3150). Since this is already low volume, how can this be throttled to avoid tripping S3150 blocks? If they were sending hundreds or thousands of emails per hour (or changing between low and high(er) volume) then sure it's obvious how to change behaviour, but single digit emails per day shouldn't "randomly" trigger a rate limit block? What are we missing? The above outbound mail rate looks fairly constant to me. Regards, Damien [https://static.layershift.com/logos/layershift/stacked_left-align_120x112.png]<https://www.layershift.com/> Registered office: Layershift Limited, Piccadilly Business Centre, Aldow Enterprise Park, Manchester, M12 6AE, United Kingdom Layershift Limited is a company registered in England and Wales (6036217).
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