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]> 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
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