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Last updated on Sep 25 at 01:54pm EDT

app.improvmx.com
100.000% uptime
30 days ago
Today
api.improvmx.com
100.000% uptime
30 days ago
Today
mx1.improvmx.com
99.641% uptime
30 days ago
Today
mx2.improvmx.com
99.641% uptime
30 days ago
Today
smtp.improvmx.com
99.631% uptime
30 days ago
Today

Previous incidents

Sep 24, 2025

We are currently investigating a DDOS against our mail servers.

Downtime

Resolved Sep 24 at 11:27am EDT

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...

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