Proton Mail
Encrypted hosted email in Switzerland, with storage and features gated by subscription tier.
3 self-hosted replacements in this index, ranked by GitHub stars in the dataset.
Replacements
docker-mailserver
Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container. Only configuration files, no SQL database.
19,715 stars Active
31 Oct 2026 v16.0.1
Mail-in-a-Box
Turns any Ubuntu server into a fully functional mail server with one command.
15,453 stars Active
22 Oct 2026 v77
Mailcow
Mail server suite based on Dovecot, Postfix and other software, that provides a modern Web UI for administration.
13,728 stars Active
21 Oct 2026 2026-10
Popular comparisons
The most-starred pairings among these replacements, ranked by combined GitHub stars in the dataset.