All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).
- Stars
- 15.2k
- Last commit
- 9 days ago
- Licence
- Not stated
Open-source alternatives to Gmail
Google's email service for personal and business mailboxes.
4 open-source swaps40.8k GitHub stars between them
The open-source options, most starred first
Read from GitHub. Check the licence and what each one covers before you switch.
Experience email the way you want with Mail0 – the first open source email app that puts your privacy and safety first. Join the discord:…
- Stars
- 10.9k
- Last commit
- 5 months ago
- Licence
- MIT
Insular email distribution - mail server as Docker images
- Stars
- 7,562
- Last commit
- 9 days ago
- Licence
- Custom
The Roundcube Webmail suite
- Stars
- 7,221
- Last commit
- 14 days ago
- Licence
- GPL-3.0
