Mailspring
Mailspring is a desktop email client for Linux, macOS, and Windows, with a unified inbox for multiple accounts.
What Mailspring is
Mailspring is a desktop email client for Linux, macOS, and Windows, with a unified inbox for multiple accounts. It supports providers including Gmail, iCloud, Office 365, Fastmail, Outlook.com, Yahoo!, and IMAP/SMTP services, and indexes messages for advanced Gmail-style searches across connected accounts. The client works offline and includes undo send, spell and grammar checking, custom themes, dark mode, and localization in its free tier. Pro adds read receipts, link tracking, send later, follow-up reminders, templates, contact profiles, snoozing, and mailbox insights. Mailspring connects to mail providers through IMAP and to calendars and contacts through CalDAV and CardDAV, though calendar tools are not included in the app. It can translate drafts into Spanish, Russian, simplified Chinese, French, and German, and offer to translate incoming messages. Credentials are stored in the system keychain; Mailspring says it does not transmit, store, or process email in the cloud. The codebase is open source under the MIT license. Mailspring Pro costs $8 a month, billed monthly.
Good
- Combines multiple supported accounts in one inbox.
- Works offline and indexes mail for advanced searches.
- Free features include undo send and spell checking.
- Translates drafts into five listed languages.
- Full codebase is open source under MIT license.
Watch out
- Calendar tools are not included in the app.
- Pro costs $8 a month, billed monthly.
- Available platforms are Linux, macOS, and Windows only.
Who it suits
Mailspring suits desktop users who manage multiple email accounts and want offline access, indexed search, and a unified inbox. Users who need read receipts, templates, or send-later tools can consider Pro.
Verdict
Mailspring brings multi-account email, offline access, and indexed search to desktop users, with several useful tools in its free client. Pro adds follow-up and tracking features for $8 a month, billed monthly.
Plans and prices
From Mailspring's own pricing page, checked 21 Sep 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Basic | — | Unlimited accounts |
| Free | Free | Free email client and features · Pro features can be tried a few times each week |
| Mailspring Pro | $8 a month | Templates · contact profiles · follow-up reminders · read receipts · link tracking · send later · grammar check · company overviews · snooze messages · mailbox insights · $8/mo |
The facts
Each one read from Mailspring's own pages, with the date it was checked.
What it does
- Accounts
- It supports multiple accounts, including Gmail, iCloud, Office 365, Fastmail, Outlook.com, Yahoo!, and IMAP/SMTP providers, in a unified inbox.checked 4 Oct 2026
- Calendar tools
- Nochecked 21 Sep 2026
- Cloud data
- Mailspring says it provides a way to delete information it stores in the cloud in compliance with GDPR.checked 4 Oct 2026
- Integrations
- Mailspring syncs directly with mail providers using IMAP and with calendars and contacts using CalDAV and CardDAV.checked 4 Oct 2026
- Offline access
- Yeschecked 21 Sep 2026
- Open source
- The maker says the full codebase is open source under the MIT license.checked 4 Oct 2026
- Product
- Mailspring is a native desktop email client for people who take email seriously.checked 4 Oct 2026
- Pro features
- Pro includes read receipts, link tracking, send later, follow-up reminders, templates, contact profiles, snoozing, and mailbox insights.checked 4 Oct 2026
- Scheduled sending
- Yeschecked 21 Sep 2026
- Search
- Mailspring indexes email to support advanced Gmail-style searches across connected accounts.checked 4 Oct 2026
- Security
- Email credentials are stored in the system keychain, and Mailspring says it does not transmit, store, or process email in the cloud.checked 4 Oct 2026
- Support
- For security vulnerability reports, the maker gives [email protected] and says users can expect a response within a few hours.checked 4 Oct 2026
- Translation
- Mailspring can translate draft messages into Spanish, Russian, simplified Chinese, French, and German, and can offer to translate incoming messages.checked 4 Oct 2026
- Unified inbox
- Yeschecked 21 Sep 2026
Where it runs
- App coverage
- desktopchecked 21 Sep 2026
- Platforms
- Downloads are offered for Windows, macOS, and Linux, including Windows ARM64, Apple Silicon, and Linux ARM packages.checked 4 Oct 2026
The company
- Company
- Mailspring is built and maintained by Foundry376, described by the maker as a small, independent team with no outside investors.checked 4 Oct 2026
- Headquarters
- San Francisco, California, United Stateschecked 28 Sep 2026
Money
- Free features
- The free client includes undo send, spell checking, grammar checking, custom themes, dark mode, and localization.checked 4 Oct 2026
- Free plan
- Yeschecked 21 Sep 2026
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