Jarland Donnell via mailop wrote on 23/02/2026 20:48: > 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.
We've been seeing this too since yesterday. Looking at our queue this morning, this is /only/ the free MS domains, hotmail.com, outlook.com, etc. We no longer have any emails queued to MS hosted domains (365 I guess). I've logged a support ticket via https://olcsupport.office.com/. Once I get past the automatic "there are no problems with your IP address" responses, hopefully I'll get the "mitigated" email and all will be well. It's quite a pain though. Seems like they're really trying hard to break stuff. Ronny -- 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
