Previous incidents

October 2025
Oct 08, 2025
1 incident

Investigating delayed delivery times.

Degraded

Resolved Oct 8, 2025 at 5:10pm UTC

PostMortem posted to our blog: https://improvmx.com/blog/post-mortem-2025-10-08

4 previous updates
Oct 05, 2025
1 incident

Investigating increased error rates on deliveries and api.improvmx.com

Degraded

Resolved Oct 5, 2025 at 2:36pm UTC

Post Mortem has been posted to improvmx.com/blog/2025-10-05-post-mortem-sql-servers-overloaded

3 previous updates
Oct 04, 2025
1 incident

Delayed Email Deliveries

Degraded

Resolved Oct 4, 2025 at 9:54pm UTC

Post Mortem has been posted to improvmx.com/blog/post-mortem-backed-up-delivery-queue

We sincerely apologize for the downtime here, this doesn't meet our reliability bar. We will diligently make improvements to prevent this kind of issue going forward.

5 previous updates
September 2025
Sep 23, 2025
1 incident

We are currently investigating a DDOS against our mail servers.

Downtime

Resolved Sep 24, 2025 at 3:27pm UTC

Post Mortem

(also posted to improvmx.com/blog/2025-09-23-post-mortem)

Summary

Spike in connections overloaded our SQL server and triggered a latent performance degradation in SQL lookups, causing delayed delivery until performance mitigation.

Timeline

11:30AM EST: Incoming mail connections spike to 30x steady state, causing increased load on our servers
11:49AM [Downtime Begins]: Emails begin being delayed/backed up.
11:58AM [*Fir...

3 previous updates
August 2025
No incidents reported