Wild guess (somewhat tongue in cheek): They asked their AI coding assistant to create a system that reduces outgoing spam from their customer services, as the abuse desk can't keep up with the sheer amount of abuse reports.
As is common with AI-generated solutions, it was slightly off the mark and blocked not only outgoing spam, but incoming non-spam as well. Since this code was generated by AI, none of the Microsoft engineers was able to understand and fix it, so after trying for some days they just reverted everything. Cheers, Hans-Martin Am 26. Februar 2026 14:35:08 schrieb "Scott Q. via mailop" <[email protected]>: > Coincidence or not, the moment the issue got fixed, we got hit with thousands > of spams from @outlook.com . It had quieted down during this 'event'. > > > On Thursday, 26-02-2026 at 04:21 Ronny Adsetts via mailop wrote:Yup, our mail > queue started emptying at 22:49 GMT last night. No human response to our > ticket yet. > I don't suppose it will happen but it would be nice to see a post-mortem from > MS assuming they even publicly acknowledge an issue. > Ronny > John Stitt via mailop wrote on 26/02/2026 03:39: > Can also confirm ours started flowing a few hours ago. We didn’t bother > opening a ticket. Our queue is almost empty now > > John Stitt > Sr. Network Engineer > HES energynet > > Sent from my pocket CRAY-1 > On Feb 25, 2026, at 9:38 PM, Allen Kevorkov via mailop <[email protected]> > wrote: > > Confirming notable improvement as of Tuesday afternoon (Feb 24) > > > > > On Wed, Feb 25, 2026 at 10:09 PM, Jarland Donnell via mailop > <[email protected]> wrote: > Forgive me for adding noise. But as I started this particular thread, it > seemed to me that it might be courteous to report that as of this > evening it has been completely resolved for us. This does not appear to > be in response to our tickets with them, this appears to be in response > to a fix that was deployed within the last few hours. > > On 2026-02-23 14:48, Jarland Donnell via mailop wrote: >> I just wanted to poke around and ask if anyone else was seeing an >> increase in behavior like this today from MS: >> >> 451 4.7.650 The mail server [136.175.108.47] has been temporarily rate >> limited due to IP reputation. For e-mail delivery information, see >> https://aka.ms/postmaster (S775) [Name=Protocol Filter >> Agent][AGT=PFA][MxId=11BCD799F8C0D17A] >> [DB1PEPF00050A01.eurprd03.prod.outlook.com 2026-02-23T20:36:05.976Z >> 08DE6BCD08E3CD4A] >> >> I mean, we fight harder against outbound spam than any ESP I've ever >> witnessed, to the point that spammers frequently call me a "Nazi." No >> significant number of complaints over their FBL, but every one is >> actioned. I'll accept if it's just me, but it would be nice to hear >> it's not just me. >> _______________________________________________ >> mailop mailing list >> [email protected] >> https://list.mailop.org/listinfo/mailop > > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop > > > CAUTION: This email originated from outside of the organization. Do not click > links or open attachments unless you recognize the sender and know the > content is safe. If you are not expecting this message contact the sender > directly via phone/text to verify. > > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop > > > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop > -- > > Ronny Adsetts > Technical Director > Amazing Internet Ltd, London > t: +44 20 8977 8943 > w: www.amazinginternet.com > Registered office: 85 Waldegrave Park, Twickenham, TW1 4TJ > Registered in England. Company No. 4042957 > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop
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