Out of sheer desperation, I just tried visiting
https://aka.ms/postmaster, but was redirected to
https://substrate.office.com/ip-domain-management-snds/postmaster/ and
got an error code: 500 Internal Server Error! Everything's working fine
for you, Microsoft! :)
Am 24.02.2026 um 09:20 schrieb Dan Malm via mailop:
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.
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