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Fastmail Outage History

Every past Fastmail outage tracked by IsDown, with detection times, duration, and resolution details.

There were 36 Fastmail outages since August 2024. The 18 outages from the last 12 months are summarized below, with incident details, duration, and resolution information.

Minor March 26, 2026

March 2026: Interrupted access to Fastmail services

Detected Mar 26, 2026 1:08 PM EDT · Resolved Mar 26, 2026 3:04 PM EDT · Duration about 2 hours

Fastmail experienced interrupted access to their web client and mobile app services for 1.9 hours. The company implemented a fix and confirmed no mail was lost during the incident. Service was restored and monitored to ensure stability.

Minor February 23, 2026

February 2026: Interrupted access to Fastmail services

Detected Feb 23, 2026 9:16 PM EST · Resolved Feb 23, 2026 9:20 PM EST · Duration 4 minutes

Fastmail experienced a brief service interruption that prevented some customers from accessing their email services through the website, web client, and mobile app. The outage lasted approximately 4 minutes and affected general service availability. The issue was resolved with no data loss reported.

Minor January 26, 2026

January 2026: Microsoft update misclassifying Fastmail emails to Outlook addresses

Detected Jan 26, 2026 11:33 PM EST · Resolved Mar 2, 2026 12:24 AM EST · Duration about 1 month

A Microsoft update caused intermittent delivery issues for Fastmail emails sent to Outlook.com addresses, with a small percentage of outgoing mail being incorrectly flagged and blocked. The issue affected mail delivery for over 34 days, recurring even after an initial fix was implemented. Fastmail worked directly with Microsoft's email team to resolve the classification problem, and delivery has now stabilized.