Email and newsletters

Missive alternatives

1 open-source project that already does this job. Free to use - not free to run, which is what the numbers on the right are for.

The full assessment →

The projects

un/inbox1,755licence unclearTeam-focused email client offering a modern shared inbox and collaboration features for professional workflows.Open on GitHub

What you give up either way

SOC 2 compliance and audited security posture
Production-grade scalability and multi-device native apps
Built-in SSO/SAML and IP restrictions out of the box
Polished integrations catalogue and sandboxed MCP connectors
Vendor support, onboarding sessions, and migration assistance

An open-source project doing the core job proves a replacement is possible. It does not prove it matches Missive, and it does not prove anyone has run it for a month. How we decide.