Everything else aside, using a 5xx status for "throttling" seems wrong
to me.
On 2026-01-23 16:51, Michael Wise wrote:
S3150 == throttling, possibly daily limit.
IIRC, S3140 is an hourly limit; check your logs and see if you got that.
Past that, Consumer is no longer my lookout, but … good luck?
And as others have said, the first response is a robot with a few
clues, but if you don’t get satisfaction, reply and “escalate”.
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> ?
*From:*Richard Laager <[email protected]>
*Sent:* Friday, January 23, 2026 12:17 PM
*To:* Michael Wise <[email protected]>
*Cc:* [email protected]
*Subject:* Re: [mailop] [EXTERNAL] Microsoft Blocking
The sending IP is: 69.89.207.151
The error is:
host hotmail-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]>
<mailto:[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
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Richard
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