Mike has been around longer than I have and I got into antispam in the late 90s. He’s been very clear he doesn’t work for Hotmail over all that period. Agreed, don’t take any frustration you have on this issue out on him.
--srs ________________________________ From: mailop <[email protected]> on behalf of Michael Denney via mailop <[email protected]> Sent: Saturday, February 21, 2026 6:41:03 AM To: Russell Clemings <[email protected]> Cc: [email protected] <[email protected]> Subject: Re: [mailop] [EXTERNAL] Anyone from Outlook? S3150 block list mirage Look - I'll apologize for coming across so irritated [I am]. My intention is not to ruffle feathers or 'chase anyone off.' I am not trying to be rude or un-civil. I am trying to solve a problem. I admit that I tend to be very blunt/short/concise and I don't 'fluff up' my messages to make them more friendly. That said I generally try hard not to waste anyone's time with unnecessarily long messages. All of that said - we are but one data point on this issue - several providers I network with socially and professionally are all experiencing this as well out of nowhere. On established IP addresses with good reputations and long histories. All of them part of the Microsoft JMRP and handle any spam complaints expeditiously. Am I annoyed with Michael Wise for providing information that, from everything I can tell, was factually inaccurate? Yes. Could it be that he was right, but the system is broken, yes. That said - if this is the case - what are any of us to do about it? It doesn't seem Mr. Wise can do anything about it. Should I do a better job of containing my frustration? I think so - and I apologize for my attitude. My irritation is with this situation more than anything and I should do a better job of containing that. Thank you, Michael Denney MDDHosting LLC http://www.mddhosting.com/ On Feb 20, 2026, at 8:02 PM, Michael Denney <[email protected]> wrote: It doesn't help if they work for Microsoft if they don't know what they're talking about, can't confirm anything, and can't actually help. Had he said, "I don't work in this department, but I believe XYZ," that is one thing. Responding as though they're authoritative when they're not and making statements of fact that don't match reality aren't helpful for anyone. That said I'm sure he has thick skin and won't disappear just because I pointed out they were wasting everyone's time with their non-help. He said you would get 4XX codes before the 550s for 3150. I have verified this is not the case for the users affected by 3150 within our network. So the information he provided was wrong. I don't see how that's helpful to any of us. Thank you, Michael Denney MDDHosting LLC http://www.mddhosting.com/ On Feb 20, 2026, at 7:56 PM, Russell Clemings via mailop <[email protected]> wrote: Hey, I have a great idea. Why don't we try to drive away the only Microsoft person who ever bothers to post anything to this list? On Fri, Feb 20, 2026 at 4:39 PM Michael Denney via mailop <[email protected]<mailto:[email protected]>> wrote: So you're of zero help, thank you for wasting everyone's time. Thank you, Michael Denney MDDHosting LLC http://www.mddhosting.com/ On Feb 20, 2026, at 6:50 PM, Michael Wise <[email protected]<mailto:[email protected]>> wrote: As I hinted previously, no. I no longer can comment on the Consumer side of the house. 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: Michael Denney <[email protected]<mailto:[email protected]>> Sent: Friday, February 20, 2026 3:49 PM To: Michael Wise <[email protected]<mailto:[email protected]>> Cc: Matthew Pounsett <[email protected]<mailto:[email protected]>>; [email protected]<mailto:[email protected]> Subject: Re: [mailop] [EXTERNAL] Anyone from Outlook? S3150 block list mirage You don't often get email from [email protected]<mailto:[email protected]>. Learn why this is important<https://aka.ms/LearnAboutSenderIdentification> I checked mail logs going back to December 2025 - and I see exactly zero 421 errors. As a matter of fact we have exactly zero 4XX responses from Outlook - network wide, but I do see 550's with the error 3150. Are you sure this is properly implemented? Feels half-baked as though it was AI vibe coded. Thank you, Michael Denney MDDHosting LLC http://www.mddhosting.com/ On Feb 20, 2026, at 6:29 PM, Michael Wise <[email protected]<mailto:[email protected]>> wrote: … slower. 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: Michael Denney <[email protected]<mailto:[email protected]>> Sent: Friday, February 20, 2026 3:27 PM To: Michael Wise <[email protected]<mailto:[email protected]>> Cc: Matthew Pounsett <[email protected]<mailto:[email protected]>>; [email protected]<mailto:[email protected]> Subject: Re: [mailop] [EXTERNAL] Anyone from Outlook? S3150 block list mirage You don't often get email from [email protected]<mailto:[email protected]>. Learn why this is important<https://aka.ms/LearnAboutSenderIdentification> We’ve also been seeing this. Clients that have dedicated mailing IPs that haven’t had issues and have been established for a long time. No new increased flows - normal transactional emails. Even opened a ticket and got told everything was fine. If it’s throttling - why not just say that? So what do we tell customers? “Microsoft things you’re sending too much mail and there’s nothing you can do but send less mail.”? Thank you, Michael Denney MDDHosting LLC https://www.mddhosting.com/ On Feb 20, 2026, at 6:11 PM, Michael Wise via mailop <[email protected]<mailto:[email protected]>> wrote: It’s IP specific, and is dynamically assigned. 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]<mailto:[email protected]>> Sent: Friday, February 20, 2026 2:50 PM To: Michael Wise <[email protected]<mailto:[email protected]>> Cc: [email protected]<mailto:[email protected]> Subject: Re: [EXTERNAL] [mailop] Anyone from Outlook? S3150 block list mirage On Fri, Feb 20, 2026 at 5:01 PM Michael Wise <[email protected]<mailto:[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<http://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. _______________________________________________ mailop mailing list [email protected]<mailto:[email protected]> https://list.mailop.org/listinfo/mailop _______________________________________________ mailop mailing list [email protected]<mailto:[email protected]> https://list.mailop.org/listinfo/mailop -- =============================================== Russell Clemings <[email protected]<mailto:[email protected]>> =============================================== _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
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