The sending IP is: 69.89.207.151
The error is: hosthotmail-com.olc.protection.outlook.com[52.101.124.116]
said: 550 5.7.1
Unfortunately, messages from [69.89.207.151] 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=11BCB3384C466A02]
[TY2PEPF0000AB88.apcprd03.prod.outlook.com 2026-01-23T18:28:25.569Z
08DE599C29725F4D] (in reply to MAIL FROM command)
On 2026-01-23 13:54, Michael Wise via mailop wrote:
It’s almost certainly throttling due to volume.
But we’d know better if you could share …
The Sending IP
The full error message.
Was it a 450 System Busy, please try again later? Then it’s absolutely
throttling.
Aloha,
Michael.
--
*Michael J Wise*
MicrosoftCorporation| Spam Analysis
"Your Spam Specimen Has Been Processed."
Open a ticket for Hotmail
<http://go.microsoft.com/fwlink/?LinkID=614866> ?
-----Original Message-----
From: mailop <[email protected]> On Behalf Of Richard Laager
via mailop
Sent: Friday, January 23, 2026 11:00 AM
To: [email protected]
Subject: [EXTERNAL] [mailop] Microsoft Blocking
Microsoft is blocking mail from us (Wikstrom Telephone Company, small,
rural ISP).
My guess is this is a lingering or second-order effect from yesterday's
outage. For example, since all that mail was delayed, when they came
back online, perhaps the resulting higher volume of mail tripped their
spam filtering.
I submitted support request 7096434358 at olcsupport.office.com.
I received an automated or form response that effectively says we are
not blocked. But we still are. The automated/form response asked for
specific error messages, which I had already provided in the support
request (it was a required field). I replied to the email with a fresh
example.
Anyone have other ideas or a useful contact?
--
Richard Laager
IT Manager
Wikstrom Telephone Company
_______________________________________________
mailop mailing list
[email protected] <mailto:[email protected]>
https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Flist.mailop.org%2Flistinfo%2Fmailop&data=05%7C02%7Cmichael.wise%40microsoft.com%7Cf22b7d8e94f4433ed17508de5ab37386%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C639047923954862518%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=cO8ju7o7ZkXD5oHZU%2BI63TEBgxo%2BZyZsUldiUseB2l4%3D&reserved=0
<https://list.mailop.org/listinfo/mailop>
_______________________________________________
mailop mailing list
[email protected]
https://list.mailop.org/listinfo/mailop
--
Richard
_______________________________________________
mailop mailing list
[email protected]
https://list.mailop.org/listinfo/mailop
