On 2/24/26 08:26, Dan Malm via mailop wrote:
On 2/23/26 21:48, 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.
Same here. 2026-02-23 ~17:55 UTC we started getting S775 errors for a
group of ips only used for our own applications, so spam is unlikely
(but not impossible). SNDS shows no data at all for any of these ips and
we've received a total of two FBL reports (that looks invalid) from MS
on them in the last 30 days...
Actually... Looking further... It appears we have the same issue on all
ips, not just the ones mentioned above. It's just more visible on the
queues on the "internal" ones.
--
BR/Mvh. Dan Malm, Systems Engineer, one.com
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