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Outage in Yello

[Yello Enterprise] Delayed emails to Microsoft users

Resolved Minor
January 27, 2026 - Started 18 days ago - Lasted about 18 hours
Official incident page

Incident Report

We are aware of an issue with delayed emails to Microsoft addresses due to rate limiting from their spam protection system. We are investigating and actively working with Microsoft to resolve the issue.

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Latest Updates ( sorted recent to last )
RESOLVED 17 days ago - at 01/28/2026 04:42PM

Our monitoring indicates this throttling has stopped and that the deferred emails have now been delivered.

INVESTIGATING 18 days ago - at 01/27/2026 11:07PM

We are aware of an issue with delayed emails to Microsoft addresses due to rate limiting from their spam protection system. We are investigating and actively working with Microsoft to resolve the issue.

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