Email

Paid standards-based email, calendar, and contacts from an Australian company, with no ads or data mining.

Opinionated paid email and calendar from 37signals, with a HEY-only client and no IMAP.

Paid German webmail and groupware suite with optional PGP and an encrypted mailbox option.

End-to-end encrypted webmail run by a Swiss company, with paid tiers for custom domains and more storage.

End-to-end encrypted email and calendar from a German company, formerly known as Tutanota.

An opinionated single-box mail server for Ubuntu that wires up Postfix, Dovecot, DNS, webmail, and backups in one installer.

A Docker-based mailserver suite bundling Postfix, Dovecot, SOGo, and a webmail UI behind one config.

All-in-one mail and collaboration server written in Rust, ships as a single binary.