We are seeing an increase in "delays"/4xx errors on outbound message delivery for some SparkPost and SparkPost Enterprise customers (US hosted only)

Incident Report for SparkPost

Resolved

This incident has been resolved.

Posted Dec 10, 2020 - 16:19 EST

Monitoring

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

Posted Dec 10, 2020 - 15:49 EST

Investigating

We are seeing an increase in "delays"/4xx errors on outbound message delivery for some SparkPost and SparkPost Enterprise customers (US hosted only). This is a small fraction of outbound mail.
Note: This issue does not impact our SparkPost customers hosted in the EU.

Posted Dec 10, 2020 - 15:32 EST

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