[EU & US] Global Cloudflare Outage
Incident
Report for Nylas v3
Postmortem
Cloudflare has posted a detailed Postmortem for their outage here: https://blog.cloudflare.com/18-november-2025-outage/
Resolved
We are pleased to report that the incident impacting services via Cloudflare has now been fully resolved. Cloudflare posted their resolution at 11:28 a.m. PT on November 18, 2025 (19:28 UTC).
Cloudflare Status: https://www.cloudflarestatus.com/incidents/8gmgl950y3h7
During this incident, only the following Nylas services were affected:
• developer.nylas.com (Documentation site)
• book.nylas.com (Hosted Scheduler Pages)
• Microsoft webhook delivery delays from the provider (temporary backlog)
All core Nylas API services remained fully operational throughout.
If you continue to experience any irregularities or delays, please contact our support team for assistance.
Thank you for your patience and understanding.
Cloudflare Status: https://www.cloudflarestatus.com/incidents/8gmgl950y3h7
During this incident, only the following Nylas services were affected:
• developer.nylas.com (Documentation site)
• book.nylas.com (Hosted Scheduler Pages)
• Microsoft webhook delivery delays from the provider (temporary backlog)
All core Nylas API services remained fully operational throughout.
If you continue to experience any irregularities or delays, please contact our support team for assistance.
Thank you for your patience and understanding.
Update
This outage also appears to have impacted Microsoft, resulting in delays in notifications sent to Nylas. We observed a large spike in inbound notifications, which we believe was a catch-up from their earlier delays. We have fully processed the remaining backlog, and latencies are back to normal.
Cloudflare is continuing to report that some customers are still experiencing issues and that their incident is not yet fully resolved. We will continue to monitor closely and provide updates as conditions evolve.
https://www.cloudflarestatus.com/incidents/8gmgl950y3h7
Cloudflare is continuing to report that some customers are still experiencing issues and that their incident is not yet fully resolved. We will continue to monitor closely and provide updates as conditions evolve.
https://www.cloudflarestatus.com/incidents/8gmgl950y3h7
Update
Cloudflare experienced a global outage that impacted several services across the internet. As a result, some Nylas systems that rely on Cloudflare were temporarily unreachable. Specifically:
• developer.nylas.com (Docs Site)
• book.nylas.com (Hosted Scheduler Pages)
Core Nylas API services were not impacted.
Cloudflare has implemented a fix and we are seeing full recovery. We will continue to monitor until we confirm complete stability.
Cloudflare’s incident report can be found here:
https://www.cloudflarestatus.com/incidents/8gmgl950y3h7
• developer.nylas.com (Docs Site)
• book.nylas.com (Hosted Scheduler Pages)
Core Nylas API services were not impacted.
Cloudflare has implemented a fix and we are seeing full recovery. We will continue to monitor until we confirm complete stability.
Cloudflare’s incident report can be found here:
https://www.cloudflarestatus.com/incidents/8gmgl950y3h7
Monitoring
We are continuing to monitor the widespread Cloudflare global network disruption.
Investigating
Cloudflare Global Network experiencing issues.
This incident affected: Subprocessors (CloudFlare) and 3rd Party Providers (Cloudflare).