Lettermint experienced a minor incident on July 15, 2026 affecting Lettermint website and Incoming and 1 more component, lasting —. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Jul 15, 2026, 03:00 PM UTC
Status: Investigating We are investigating an increase in 503 Service Unavailable responses. Affected components Lettermint website (Operational) SMTP Relay (Partial outage) Outgoing (Broadcast) (Operational) Lettermint UI (Operational) Sending API (Partial outage) Team API (Partial outage) Outgoing (Transactional) (Operational) Incoming (Partial outage) Webhooks (Operational)
- monitoring Jul 15, 2026, 03:01 PM UTC
Status: Monitoring We experienced a brief period of API unavailability, during which some requests returned 503 Service Unavailable. Multiple API instances temporarily became unresponsive at the same time, leaving insufficient capacity to serve requests. Service has been restored and remains stable. We are monitoring closely and investigating what caused the instances to become unresponsive. Affected components Lettermint website (Operational) Team API (Operational) Outgoing (Transactional) (Operational) Incoming (Operational) SMTP Relay (Operational) Outgoing (Broadcast) (Operational) Webhooks (Operational) Lettermint UI (Operational) Sending API (Operational)
- resolved Jul 15, 2026, 03:15 PM UTC
Status: Resolved API availability has been fully restored and the platform has remained stable. We reverted a health-check configuration that reacted too aggressively to a brief traffic spike, causing healthy instances to be temporarily removed from service. We have confirmed normal operation and are reviewing additional safeguards to prevent a recurrence. Affected components Lettermint UI (Operational) Team API (Operational) Outgoing (Transactional) (Operational) Incoming (Operational) Outgoing (Broadcast) (Operational) Lettermint website (Operational) Sending API (Operational) SMTP Relay (Operational) Webhooks (Operational)