Resend had 32 outages in the last 2 years totaling 38m of downtime — averaging 1.3 incidents per month.
There were 32 Resend outages since January 27, 2026 totaling 38m of downtime. Each is summarised below — incident details, duration, and resolution information.
Status: Identified We have identified the issue and we are working on a fix now.
Status: Identified We have identified the issue and we are working on a fix now. Affected components Email Events (Partial outage)
Status: Investigating We are currently investigating issues with downloading attachments where existing download URLs would incorrectly return a 403 response. Affected components General API (Degraded performance)
Status: Monitoring The fix for downloading email attachments has been pushed and we are now monitoring the situation. Affected components General API (Operational)
Status: Resolved We have resolved the underlying issue and service has been resumed. Affected components General API (Operational)
Status: Identified We are currently reverting a change that cause quotas to be calculated incorrectly. Affected components Single Email (Degraded performance) Broadcast Emails (Degraded performance) Batch Emails (Degraded performance)
Status: Monitoring The fix has been pushed and we are now monitoring the situation. Affected components Single Email (Degraded performance) Broadcast Emails (Degraded performance) Batch Emails (Degraded performance)
Status: Resolved We have resolved the underlying issue and service has been resumed. Affected components Single Email (Operational) Broadcast Emails (Operational) Batch Emails (Operational)
Status: Investigating We are currently investigating increased latency in Resend dashboard. At this time, you may experience delays and errors while trying to access our dashboard. Affected components Single Email (Operational) Dashboard (Full outage) SMTP (Operational) Broadcast Emails (Operational) Batch Emails (Operational) General API (Operational) Webhooks (Operational) Website (Operational) Email Events (Operational)
Status: Resolved We have resolved the underlying issue and service has been resumed. Affected components Batch Emails (Operational) General API (Operational) Webhooks (Operational) Single Email (Operational) Dashboard (Operational) Website (Operational) Email Events (Operational) SMTP (Operational) Broadcast Emails (Operational)
Status: Identified A recent change to how Resend processes inbound emails affected customers who receive emails via server-side forwarding rules, where a mail server automatically redirects an email to a different address without rewriting its headers. When an email is forwarded this way to a Resend inbound address, the to field in the inbound webhook payload began reflecting the original "To" header (e.g. [email protected]) rather than the address that actually received the delivery (e.g. your Resend inbound address). Direct emails and client-side forwards were not affected. Affected components SMTP (Operational) Broadcast Emails (Operational) Batch Emails (Operational) Webhooks (Degraded performance) Single Email (Operational) Dashboard (Operational) Email Events (Operational) General API (Operational) Website (Operational)
Status: Resolved We have resolved the underlying issue by reverting the unintended breaking change and service has been resumed. Affected components Single Email (Operational) Dashboard (Operational) General API (Operational) Webhooks (Operational) Email Events (Operational) SMTP (Operational) Broadcast Emails (Operational) Batch Emails (Operational) Website (Operational)
Status: Investigating Since 09:45 UTC on May 5, 2026, new customers are unable to create custom tracking domains. Existing tracking domains and email sending are not affected. We've identified the cause as an upstream infrastructure limit and are working with our provider to resolve it.
Status: Monitoring Issue identified and resolved for new requests. New customers can now create custom tracking domains again. We're replaying the failed provisioning requests from the outage window. This may take some time to fully process.
Status: Resolved This incident is resolved. All failed provisioning requests have been reprocessed, and custom tracking domain creation is operating normally.
Status: Investigating We are currently investigating a delay in updating of email events. Emails are being sent/delivered, though the events may display as Queued. Affected components Email Events (Degraded performance)
Status: Identified We've identified the cause of the delay in email events. Event statuses are beginning to catch up. Emails continue to be sent and delivered as normal. Only the displayed status was affected. Affected components Email Events (Degraded performance)
Status: Monitoring We've deployed a fix for the delayed events. Webhook deliveries and email event statuses have caught up and are updating in real time. We're monitoring to confirm the fix holds. Affected components Email Events (Degraded performance)
Status: Resolved This incident is resolved. Webhook deliveries and metrics page updates have been stable since our fix was deployed. Sending and receiving were unaffected throughout. Thanks for your patience. Affected components Email Events (Operational)
Status: Investigating We are currently investigating increased latency in email events being updated. Affected components Email Events (Degraded performance)
Status: Identified We've identified the cause of the Queued events are currently working through the backlog of events. Affected components Email Events (Degraded performance)
Status: Identified We're continuing to work through the backlog of events. Affected components Email Events (Degraded performance)
Status: Resolved The processing backlog is fully cleared. All systems are operational. Affected components Email Events (Operational)
Status: Investigating We are currently investigating an increase in latency when sending Broadcasts Affected components Broadcast Emails (Degraded performance)
Status: Monitoring We've identified the root cause. We're working with a third-party provider to solve the underlying issue as we work on mitigation actions. In addition to Broadcasts, Domain verification may take longer than usual. Affected components Broadcast Emails (Degraded performance) General API (Degraded performance) Dashboard (Degraded performance)
Status: Monitoring The underlying issue has been identified and our third-party provider has pushed improvements. We're seeing an improvement in domain verifications and broadcast email throughput. We'll continue to monitor the situation and work on mitigation actions. Affected components Dashboard (Degraded performance) Broadcast Emails (Degraded performance) General API (Degraded performance)
Status: Resolved The pending domain verifications and broadcasts are catching-up quickly. The incident should fully resolve soon. Affected components Broadcast Emails (Operational) General API (Operational) Dashboard (Operational)
Status: Investigating We are currently investigating an issue affecting email sending. At this time, you may encounter 404 errors when sending emails via our SMTP service and API. Affected components Broadcast Emails (Degraded performance) Batch Emails (Degraded performance) Single Email (Degraded performance)
Status: Identified We’ve identified the root cause and are working on a fix. We’ll share updates as soon as more information becomes available. Affected components Single Email (Full outage) SMTP (Full outage) Broadcast Emails (Full outage) Batch Emails (Full outage) General API (Full outage)
Status: Monitoring A fix has been applied for Email Sending and SMTP, and we are now monitoring the situation. You may still notice errors on our general API endpoints. Affected components General API (Full outage) Single Email (Operational) SMTP (Operational) Broadcast Emails (Operational) Batch Emails (Operational)
Status: Monitoring The fix has been pushed to the General API and we are now monitoring the situation. Affected components Single Email (Operational) SMTP (Operational) Broadcast Emails (Operational) Batch Emails (Operational) General API (Operational)
Status: Resolved We have resolved the underlying issue and service has been resumed. Affected components SMTP (Operational) Broadcast Emails (Operational) Batch Emails (Operational) General API (Operational) Single Email (Operational)
Status: Investigating We are currently investigating increased latency in email sending. At this time, you may experience delays when sending emails via our SMTP service and API. Affected components Single Email (Degraded performance) Broadcast Emails (Degraded performance) Batch Emails (Degraded performance)
Status: Identified We have identified the cause of increased latency in email sending. A subset of customers may experience delays when sending emails via our SMTP service and API. We are actively working on a resolution and will provide updates shortly. Affected components Single Email (Degraded performance) Broadcast Emails (Degraded performance) Batch Emails (Degraded performance)
Status: Monitoring We have resolved the issue causing increased latency in email sending. All emails should now be delivered without delay. Affected components Batch Emails (Operational) Single Email (Operational) Broadcast Emails (Operational)
Status: Resolved We have resolved the issue causing increased latency in email sending. Emails are being delivered normally. Affected components Single Email (Operational) Broadcast Emails (Operational) Batch Emails (Operational)
Status: Investigating We're currently investigating errors when contacts try to unsubscribe the audience/segment.
Status: Resolved We have resolved the underlying issue and service has been resumed.
Status: Identified Following our scheduled maintenance, Email Events are being delayed. No data was lost. Affected components Email Events (Degraded performance)
Status: Resolved We have resolved the underlying issue and service has been resumed. Affected components Email Events (Operational)
Status: Investigating We are currently investigating an issue affecting deliverability to Microsoft inbox providers. At this time, some emails sent to Outlook.com, Hotmail.com, and other Microsoft-owned domains may experience delivery delays.
Status: Identified We've identified that Microsoft addresses (outlook.com, hotmail.com, and other Microsoft-owned domains) are experiencing delivery delays at an elevated rate. We've informed Microsoft and are monitoring.
Status: Identified We’ve identified that this issue is impacting domains in the eu-west-1 region. We’re actively escalating with Microsoft to resolve this as quickly as possible. Please reach out to [email protected] for any questions and concerns.
Status: Monitoring We’re seeing delivery to Outlook.com, Hotmail.com, and other Microsoft-owned domains return to normal. Emails are now being delivered in a timely manner. We’ll continue to monitor closely.
Status: Resolved The issue has been resolved, and sending to Microsoft-owned domains has been restored.
Status: Investigating We are currently investigating increased latency in email sending. Emails are being accepted, though sent at a slower speed than expected. Affected components Batch Emails (Degraded performance) Single Email (Degraded performance) SMTP (Degraded performance) Broadcast Emails (Degraded performance)
Status: Investigating We are currently investigating increased latency in email sending. At this time, you may experience delays when sending emails via our SMTP service and API. Affected components SMTP (Degraded performance) Broadcast Emails (Operational) Batch Emails (Degraded performance) Single Email (Degraded performance)
Status: Identified We've identified the cause of the latency and are working to mitigate it so we can return to normal sending speed. Affected components Single Email (Degraded performance) SMTP (Degraded performance) Broadcast Emails (Operational) Batch Emails (Degraded performance)
Status: Monitoring Sending speed is back to normal. We'll continue to monitor. Affected components Broadcast Emails (Operational) Batch Emails (Operational) Single Email (Operational) SMTP (Operational)
Status: Resolved Performance is back to normal. Affected components SMTP (Operational) Broadcast Emails (Operational) Batch Emails (Operational) Single Email (Operational)
Status: Investigating We're currently investigating errors when accessing Resend. Affected components Dashboard (Degraded performance)
Status: Investigating We are currently investigating increased latency in email sending. Affected components SMTP (Degraded performance) Broadcast Emails (Degraded performance) Batch Emails (Degraded performance) Single Email (Degraded performance) Dashboard (Degraded performance)
Status: Investigating We're continuing to investigate errors during dashboard loading and latency issues with sending. Affected components SMTP (Degraded performance) Broadcast Emails (Degraded performance) Batch Emails (Degraded performance) Single Email (Degraded performance) Dashboard (Degraded performance)
Status: Investigating We've improved the dashboard's performance and are continuing to work on email latency. Affected components Batch Emails (Degraded performance) Single Email (Degraded performance) Dashboard (Degraded performance) SMTP (Degraded performance) Broadcast Emails (Degraded performance)
Status: Monitoring We've resolved the cause of the dashboard errors and email sending latency. Emails that were sent during this incident have now been sent. We're continuing to monitor as we recover. Affected components SMTP (Operational) Broadcast Emails (Operational) Batch Emails (Operational) Single Email (Operational) Dashboard (Operational)
Status: Resolved We have resolved the underlying issue and service has been resumed. Affected components Single Email (Operational) Dashboard (Operational) SMTP (Operational) Broadcast Emails (Operational) Batch Emails (Operational)
Status: Identified We've resolved the dashboard error and are working on email sending latency. Affected components Dashboard (Operational) SMTP (Degraded performance) Broadcast Emails (Degraded performance) Batch Emails (Degraded performance) Single Email (Degraded performance)
Status: Resolved We have resolved the underlying issue and service has been resumed. Affected components SMTP (Operational) Broadcast Emails (Operational) Batch Emails (Operational) Single Email (Operational) Dashboard (Operational)
Status: Investigating We are currently investigating intermittent issues when sending emails with SMTP. Affected components SMTP (Partial outage)
Status: Investigating We are continuing to investigate the intermittent SMTP issue with urgency. Our team is actively reviewing logs and monitoring system performance to identify the root cause. At this time, a small percentage of SMTP requests are failing. We will share additional updates as soon as more information becomes available. Affected components SMTP (Partial outage)
Status: Identified We are continuing to investigate and fix the intermittent SMTP issue with urgency. Affected components SMTP (Partial outage)
Status: Identified We are continuing to work on resolving the intermittent SMTP issue. A small percentage of SMTP requests may still fail. Our team is actively investigating and testing potential fixes. We will provide another update as progress is made. Affected components SMTP (Partial outage)
Status: Identified We're continuing to work on this. Some SMTP requests may still intermittently fail. Our team has been ruling out potential causes and is continuing to work toward a resolution. Affected components SMTP (Partial outage)
Status: Monitoring The fix has been pushed and we are now monitoring the situation. Affected components SMTP (Operational)
Status: Resolved We have resolved the underlying issue and service has been resumed. Affected components SMTP (Operational)
Status: Investigating We are currently investigating increased latency in broadcast sending. At this time, you may experience delays when sending broadcast emails via our API or site. Affected components Broadcast Emails (Degraded performance)
Status: Resolved Service has been resumed. Affected components Broadcast Emails (Operational)
Status: Investigating We're investigating longer-than-expected queue times for Broadcasts. Delivery is still occurring, but at a reduced pace. We'll provide updates as we learn more. Affected components Broadcast Emails (Degraded performance)
Status: Resolved Broadcast sending has returned to normal speed. Queue times are back to expected levels. Thank you for your patience. Affected components Broadcast Emails (Operational)