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]> 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>
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