Outage in Postmark

SMTP Authentication Issues

Resolved Major
September 10, 2025 - Started about 2 months ago - Lasted 1 day
Official incident page

Incident Report

Customers may experience SMTP Authentication issues with API keys generated on or after Saturday, September 6). Customers using older keys should not be impacted.

Need to monitor Postmark outages?

One place to monitor all your cloud vendors. Get instant alerts when an outage is detected.

Start Free Trial

Latest Postmark outages

Partial Service Outage (Sending Not Affected) - 30 days ago
[Scheduled] Database Maintenance - about 2 months ago
[Scheduled] Planned Maintenance - about 2 months ago
API Latency and Timeout Errors - 2 months ago
Intermittent Inbound Email Delays - 2 months ago

The Status Page Aggregator Built for IT Teams

With IsDown, you can monitor all your critical services' official status pages from one centralized dashboard and receive instant alerts the moment an outage is detected. Say goodbye to constantly checking multiple sites for updates and stay ahead of outages with IsDown.

Start free trial

No credit card required · Cancel anytime · 4522 services available

Integrations with Slack Microsoft Teams Google Chat Datadog PagerDuty Zapier Discord Webhook