> On 23 Feb 2026, at 16:48, Jarland Donnell via mailop <[email protected]> > 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.
We are having the same issue. Our IPs disappeared from our SNDS dashboard. After we reinstated one, it shows all green with no abuse hits. But that IP is rate-limited anyways and we cant get our queues sent there. Right now about 10 of our IPs are rate limited, severely impacting our deliverability to microsoft customers. It feels like we got some very small rate limit that in no way reflects the amount of email we send them. On top of that, emails that SNDS sends us are malformed, we’re having a hard time even logging in SNDS. I think microsoft has moved to a new system that’s not working very well. No one from microsoft reading any of this? We have hundreds of thousands of mailboxes and can’t get our queues out. We are hesitant to route queued email to IPs that still work and have them fail as well. Regards, Cor Bosman _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
