[US/EU] Messages API - Elevated 404 Errors for IMAP Grants
View the provider incident record →Current answer
Nylas experienced a minor incident: [US/EU] Messages API - Elevated 404 Errors for IMAP Grants. ServiceAlert observed recovery on Sep 17, 2026.
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Incident Lifecycle
Affected Components
API v3
IMAP v3
Incident Timeline
Monitoring
<b>Mitigated</b> - The remediation has been fully deployed across the US and EU regions, and IMAP synchronization and error rates have returned close to normal operating levels.
Some previously affected grants may still be catching up on messages missed during the incident. We are continuing to monitor recovery closely and validate that synchronization remains stable before resolving the incident.
Some previously affected grants may still be catching up on messages missed during the incident. We are continuing to monitor recovery closely and validate that synchronization remains stable before resolving the incident.
Sep 17, 2026 at 2:23 PM UTC
Monitoring
We identified an issue in IMAP message processing that could cause synchronization to stop when certain messages were encountered, resulting in 404 responses when those messages were retrieved by ID.
A remediation has now been fully deployed across the US and EU regions. Message synchronization and success rates are recovering, and we are continuing to validate stability before resolving the incident.
A remediation has now been fully deployed across the US and EU regions. Message synchronization and success rates are recovering, and we are continuing to validate stability before resolving the incident.
Sep 17, 2026 at 1:48 PM UTC
Identified
We have identified an issue in IMAP message processing that can cause synchronization to stop when certain messages are encountered, resulting in 404 responses when those messages are retrieved by ID.
Our team is actively working on remediation and validating the appropriate recovery path. We will provide another update as this work progresses and we confirm recovery.
Our team is actively working on remediation and validating the appropriate recovery path. We will provide another update as this work progresses and we confirm recovery.
Sep 17, 2026 at 1:03 PM UTC
Investigating
We are investigating elevated 404 errors when retrieving specific messages via the Messages API for IMAP grants in the US and EU regions. Some messages that exist in the provider mailbox may return a 404 response when retrieved by ID.
Our team is actively investigating the issue and working to restore normal message retrieval. We will provide additional information as it becomes available.
Our team is actively investigating the issue and working to restore normal message retrieval. We will provide additional information as it becomes available.
Sep 17, 2026 at 12:31 PM UTC
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