Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)

Incident Report for SparkPost

Resolved

This incident has been resolved.

Posted Sep 17, 2026 - 06:00 EDT

A fix has been implemented and we are monitoring the results.

Posted Sep 17, 2026 - 05:47 EDT

We are investigating an increase in delivery latency for some outbound messages. (NOTE: This does not impact our customers hosted in the EU.)

Posted Sep 17, 2026 - 05:06 EDT

This incident affected: SMTP Delivery (Outbound Message Delivery) (SMTP Delivery - USA).