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 Microsoft Corporation| 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 Microsoft Corporation| 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]<mailto:[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]<mailto:[email protected]> https://list.mailop.org/listinfo/mailop -- Richard
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