Nylas Status

Monitoring: Microsoft has disabled Basic (Non-OAuth) authentication for Exchange Online mailboxes using Free or Family licenses - also known as Personal Accounts. These include free email addresses using the domains outlook.com, hotmail.com, live.com, msn.com, and others.

Microsoft only allows these mailboxes to use Exchange Web Services and Exchange ActiveSync using Basic authentication, so these mailboxes are no longer able to utilize those services. Our API v2 uses both of those services to communicate with all Microsoft mailboxes.

Microsoft has provided no work-around for continuing to use those services, so these mailboxes can no longer use our API v2 and must start using our API v3. We use Microsoft Graph API for our API v3 and that is not affected.

This does NOT affect paid mailboxes using Microsoft's Business or School licenses. This also does NOT affect on-premise Exchange mailboxes. Only free mailboxes using Microsoft's Free or Family licenses are affected.

Resolved: This incident has been fully resolved. API v2 error rates have remained stable following the manual failover of the impacted database cluster, and all services are operating normally.

We sincerely apologize for the disruption this caused to your systems and your customers. Thank you for your patience while we worked to restore full service.

Monitoring: We have successfully completed the manual failover for the affected database cluster. API v2 error rates have returned to normal levels, and the platform is stable.

We are continuing to monitor the system closely to ensure full recovery and prevent any recurrence. We’ll provide a final update once the incident is fully resolved.

Investigating: Starting at approximately 6:00 AM PT, we observed elevated 500 errors on API v2 in the US region. This was caused by a brief spike in traffic related to our Link Tracking service, which lasted about 10 minutes and disrupted the automatic failover of one of our database clusters.

We have manually triggered the failover, and error rates are expected to return to normal within the next 15 minutes.

We apologize for the disruption this may have caused to your systems and customers. Our team is actively monitoring the recovery and will continue to provide updates here.