Letterhead is self-healing from the upstream outage and newsletters are going out as expected. Note, we retry delivery in a staggered pattern after such an event, so it make take up to an hour for a newsletter to fully send through its audience, depending on the audience size.
Posted Feb 24, 2026 - 15:05 EST
Update
It appears the issue has been resolved. We are checking everything on our end to ensure any resulting issues are healing, newsletters delivering, and metrics collecting.
Posted Feb 24, 2026 - 14:47 EST
Monitoring
A fix in our upstream provider has been implemented, and they - like we - are monitoring results.
Posted Feb 24, 2026 - 14:44 EST
Identified
One of our upstream providers is experiencing a partial outage, which is affecting Letterhead's newsletter delivery. Newsletter delivery may be delayed, and your newsletters' statuses may remain in "sending" for longer than usual. See: https://status.sparkpost.com/incidents/ndjn00g5vwm3
Posted Feb 24, 2026 - 14:13 EST
This incident affected: Delivery (Outbound Email Deliverability (Shared Pools)) and Services (Email Service Provider, Metrics).