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OpenAlternative

Open Source Gmail Alternatives

A curated collection of the 4 best open source alternatives to Gmail.

The best open source alternative to Gmail is Zero. If that does not suit you, we have compiled a ranked list of other open source Gmail alternatives to help you find a suitable replacement.

Gmail alternatives are mainly AI Personal Assistants. Browse these if you want a narrower list of alternatives or are looking for a specific functionality of Gmail.

Written by OpenAlternative Last updated: June 2, 2026
#1

Zero

Self-hostable email client that connects to your existing accounts and gives you full control over your data, interface, and inbox experience.

Self-hostable email client that connects to your existing accounts and giv...

#2

Tuta

Tuta offers encrypted email, calendar and contacts with quantum-resistant security, protecting your privacy without ads or tracking.

Tuta offers encrypted email, calendar and contacts with quantum-resistant ...

#3

UnInbox

Streamline team communication with shared inboxes, unlimited email addresses, and customizable workflows. Perfect for modern businesses seeking organi

Streamline team communication with shared inboxes, unlimited email address...

#4

Twake Mail

Open source professional email solution with PGP encryption, JMAP protocol, AI-powered responses, and advanced antispam protection. Control your data

Open source professional email solution with PGP encryption, JMAP protocol...