Data resilience at Fastmail
A story of a close call, where users lost entire mailboxes due to a bug, but backups allowed us to bring everything back.
Technical
RSS
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The Cache Crash
What happens when a mysterious bug causes all your tests to fail once or twice a week? We try to solve these mysteries, even if it takes a year.
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Introducing the twom database format
We replaced the twoskip database format with something faster and better. -
Dec 22: Why we use our own hardware at Fastmail
Why we use our own hardware and what the tradeoffs and costs look like
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Dec 21: Fastmail in a box
How we build a complete Fastmail development environment. -
Dec 19: Building offline: mail storage
How we made your mail work fast offline.
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Dec 18: Building offline: syncing changes back to the server
How offline changes are tracked and replayed. -
Dec 17: Building offline: general architecture
A technical deep dive into how we added offline support to Fastmail. -
Dec 14: On-call systems
How Fastmail makes on-call work
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Dec 13: It’s knot DNS. There’s no way it’s DNS. It is DNS!
How we upgraded our DNS servers to Knot DNS -
Dec 12: Following the Sun
Keeping Fastmail going around the clock -
Dec 9: Building a blog
A quick look at the tools we used to build our new blog & marketing site.
