Betterbird
A Thunderbird-based email client with an additional set of fixes and usability changes.GetMPL-2.0
Email clients
Open-source email clients for Mac with multiple accounts, unified inboxes, calendars, contacts and encrypted mail.
An email client downloads and sends mail for one or more accounts, usually over IMAP and SMTP, and keeps messages available on your Mac. Some of the clients below also manage calendars and contacts.
Check which providers and protocols each client supports, whether it offers a unified inbox, and how it handles encryption. Some apps work only with one provider's service, while others connect to any standard mail account.
All Apps
5 free, open-source apps
ElectronMail
An unofficial Proton Mail desktop client with multiple accounts, offline storage and full-text search.GetGPL-3.0
Mailspring
A cross-platform desktop mail client with a unified inbox, snoozing, send later, mail rules and templates.GetGPL-3.0
Thunderbird
Manage email accounts, calendars, and contacts in Mozilla's desktop mail application.GetMPL-2.0
Tuta Mail
Desktop client for Tuta, the end-to-end encrypted email and calendar service.GetGPL-3.0
