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Microsoft 365 - Email Blocking Issue
Thursday 15th February 2024 16:39:00

We are currently aware that a large number of Microsoft 365 servers are being blocked by the SpamCop RBL - this is a reoccurance of the issue Microsoft were previously tracking as EX703958.

This may affect Shared Hosting customers ability to receive emails from Microsoft-hosted customers, and Microsoft 365 customers may experience issues with sending emails.

Microsoft is understood to still be working on this issue.

As there have been no updates from Microsoft, we have implemented a temporary workaround for this issue until Microsoft resolve their issues with SpamCop. We will continue watching for any updates from Microsoft regarding the issue.

Posted 11 months ago by admin

Microsoft have acknowledged the repeat issue as incident EX719348.

You can view the status from within your Microsoft tenancy, or by using this link: https://admin.microsoft.com/Adminportal/Home?#/servicehealth/:/alerts/EX719348

If you're not logged in, you can view it publicly here: https://west.jcteams.info/jcteamsinfo/docs/EX719348.html

We'll continue monitoring the status from Microsoft until the issue is resolved.

Posted 11 months ago by admin

Microsoft has not yet fully resolved EX719348, and their latest update mentions isolating affected IP addresses which they are still doing.

This issue has also since been reported by technology news website The Register: https://www.theregister.com/2024/03/14/exchange_online_blocked_from_sending/

Posted 10 months ago by admin

Microsoft have made some adjustments to help fix EX719348, they expect their changes to take effect over the following week. We'll continue monitoring the status from Microsoft until the issue is resolved.

Posted 9 months ago by admin

Microsoft claim they have resolved EX719348. While we're yet to see a reduction in the number of their servers being blocked by SpamCop, we'll be closing this incident.

Posted 9 months ago by admin

Microsoft have re-opened the repeat issue again as incident EX801166.

You can view the status from within your Microsoft tenancy, or by using this link: https://admin.microsoft.com/Adminportal/Home?#/servicehealth/:/alerts/EX801166

We'll continue monitoring the status from Microsoft until the issue is resolved.

Posted 7 months ago by admin

Microsoft claim to have identified the source of spam from their servers. They'll continue to monitor and adjust as necessary.

Posted 7 months ago by admin