Mailspring
Mailspring offers an open-source email client for desktop users on macOS, Windows, and Linux.
About Mailspring
Mailspring is an open-source desktop email client for macOS, Windows, and Linux. Its interface is written in TypeScript with Electron and React, and its sync engine is written in C++ and C and runs locally on the user's computer.
It includes Unified Inbox, Snooze, Send Later, Mail Rules and Templates, with plugin and theme support for extension. Link tracking, read receipts, mailbox analytics and contact and company profiles require a Pro monthly subscription, and plugins must currently be sideloaded manually.
Key features
- Unified Inbox
- Snooze to defer messages
- Send Later to schedule sending
- Mail rules
- Email templates
- Plugin architecture and CSS-based themes for extension
Best for: Desktop users on macOS, Windows, and Linux who want an open-source email client they can extend.
Good for
- UI and sync engine are open source under GPLv3
- Sync engine runs locally and email credentials are not sent to the cloud
- Compiled versions available for Windows, macOS, and Linux including deb, rpm and snap
Watch out for
- Link tracking, read receipts, analytics and contact profiles require Pro monthly subscription
- No central plugin store yet; plugins must be sideloaded manually
Mailspring at a glance
- Category
- Productivity › Email Tools
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Platforms
- Linux, macOS, Windows
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Mailspring FAQ
Does Mailspring send my email credentials to the cloud?
According to the project, all features run in the client and it does not send email credentials to the cloud.
What does Mailspring Pro add?
Link tracking, read receipts, mailbox analytics, and contact and company profiles, unlocked with a monthly subscription.
How do I install plugins?
There is no central store yet; plugins must be downloaded and copied into place manually.
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