Outlook incident - emails not getting delivered

What to do

• Check whether your product depends on Stytch. Check your stack

  Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.

• Confirm your retries, queues and scheduled jobs caught up after the 0m it lasted.

  Anything that failed between 2026-01-27 13:00 UTC and 2026-01-27 13:00 UTC may need a replay.

• Subscribe to Stytch's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=stytch works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from Stytch 1

1. resolvedJan 27, 2026, 1:00 PM UTC

   Type: Incident Jan 27, 13:00:00 GMT+0 - Resolved - We are currently aware of an upstream incident with Microsoft Outlook impacting email deliveries with several of our messaging providers over the past several days. This has been widely reported across the industry, but Microsoft has not shared any public commentary as of yet. We're looking into any ways we may be able to mitigate this until Microsoft addresses the issue. Though these issues are not causing any downtime in Stytch services, due to the popularity of Microsoft Outlook, we've created this incident for posterity for customers investigating downtime in their own systems. Customers that feel they are continuing to observe excessive deferrals and/or blocks should fill out the OLC Support request form at [https://olcsupport.office.com.](https://olcsupport.office.com/)

   provider

Corrections

None so far.

Something wrong on this page? Report an error or send us a note. Every fix is listed here.