Stalwart Mail Server
Alternative to: Alternatives to Gmail
Stalwart Mail Server is an all-in-one open source email server with support for JMAP, IMAP4, and SMTP. It combines these three protocols in a single program and includes a wide range of modern features. It is for individuals or organizations looking for email server software that supports modern mail access and delivery standards, including those that specifically require JMAP, IMAP4, or SMTP. Stalwart Mail Server can serve as an open source replacement for Gmail. However, the available information does not establish feature-for-feature equivalence with Gmail or specify which Gmail capabilities have direct counterparts. Its modern features are also not detailed here beyond support for JMAP, IMAP4, and SMTP. Anyone relying on a particular Gmail function should therefore check whether Stalwart Mail Server provides that function rather than assuming it offers every feature available in Gmail.
Key features
Install
What's new in v1.0.3
## [1.0.3] - 2026-11-04 **Third-party apps (not the WebUI) need the new Stalwart OAuth scopes.** Apps signing in through Stalwart or an external OpenID Connect provider could not manage app passwords, API keys or account settings. This access is now granted by the scopes `urn:stalwart:oauth:scope:security`, `urn:stalwart:oauth:scope:settings` and `urn:stalwart:oauth:scope:full`: - Apps registered in Stalwart: add the…
