On 23/02/2026 20:48, 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]
We've just started getting S3150s on one IP address, but only on some
messages even from the same IP address. The IP address is showing as
persistently green on SDNS.
550 5.7.1 Unfortunately, messages from [178.159.10.132] weren't
sent. Please contact
your Internet service provider since part of their network is on
our block
list (S3150). You can also refer your provider to
http://mail.live.com/mail/troubleshooting.aspx#errors. [Name=Protocol
Filter Agent][AGT=PFA][MxId=11BCD839771A29D9]
[SN1PEPF000252A1.namprd05.prod.outlook.com 2026-02-24T08:07:41.486Z
08DE6C1CC435BA3A] (in reply to MAIL FROM command)
And, for added
fun, http://mail.live.com/mail/troubleshooting.aspx#errors gives a 500
HTTP error...
and we're getting the S775s on other IP addresses
Paul
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