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Fastmail Outage History

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

There were 39 Fastmail outages since August 2024. The 20 outages from the last 12 months are summarized below, with incident details, duration, and resolution information.

Minor May 29, 2026

May 2026: Interrupted access to Fastmail services

Detected May 29, 2026 11:44 PM UTC · Resolved May 30, 2026 12:01 AM UTC · Duration 17 minutes

Fastmail experienced a 17-minute service interruption caused by a failure on one of their IMAP servers, affecting a small number of users' access to the web client, mobile app, and mail delivery. The company identified the root cause within 5 minutes and successfully restored all affected services. Fastmail continued monitoring to ensure stability after the resolution.

Minor May 29, 2026

May 2026: Interrupted access to Fastmail services

Detected May 29, 2026 6:50 AM UTC · Resolved May 29, 2026 8:31 AM UTC · Duration about 2 hours

Fastmail experienced a 1.7-hour service disruption affecting a small number of users who were unable to send and receive messages or access the web client and mobile app. The issue was caused by a failure on one of Fastmail's IMAP servers. The service was restored by failing over to secondary servers.

Minor May 27, 2026

May 2026: Interrupted access to Fastmail services

Detected May 27, 2026 9:47 AM UTC · Resolved May 27, 2026 10:07 AM UTC · Duration 20 minutes

A small number of Fastmail users experienced temporary issues accessing their email due to a server issue, affecting mail delivery and general availability for 20 minutes. Fastmail services including mail, calendars, and contacts remained operational throughout the incident. The issue was resolved with no data loss.

Minor March 26, 2026

March 2026: Interrupted access to Fastmail services

Detected Mar 26, 2026 5:08 PM UTC · Resolved Mar 26, 2026 7:04 PM UTC · 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 24, 2026

February 2026: Interrupted access to Fastmail services

Detected Feb 24, 2026 2:16 AM UTC · Resolved Feb 24, 2026 2:20 AM UTC · 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 27, 2026

January 2026: Microsoft update misclassifying Fastmail emails to Outlook addresses

Detected Jan 27, 2026 4:33 AM UTC · Resolved Mar 2, 2026 5:24 AM UTC · 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.