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Microsoft Outlook blocking emails from Linode

10 January 2022

There is apparently a problem in the Microsoft Outlook network that started on or around 22 December 2021 resulting in emails sent from Linode servers being rejected with:

550 5.7.511 Access denied, banned sender

Some discussion of the problem can be found here:

From the above discussions it appears to impact Linode-hosted mail servers regardless of past email- or spam-related activity.

All we can suggest at this time is to follow the instructions in the 'bounce' emails by forwarding them to and perhaps at the same time submitting a ticket to Microsoft Support.

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