Best Open Source Email
Email is the original decentralized protocol, but over the last twenty years, it has been effectively enclosed by a few massive walled gardens. Google Workspace and Microsoft 365 now dictate the rules of email deliverability, and their dominance allows them to charge per-user fees that represent a substantial ongoing tax for any business.
The Open Source Vanguard
Proprietary Giants
The closed-source benchmarks for these open-source alternatives.
Administering a proprietary email workspace means accepting their privacy terms. Every internal communication, contract negotiation, and customer support thread is aggressively indexed to train spam filters and, increasingly, proprietary AI models. Furthermore, if an automated system flags your account, you can lose access to your company's entire communication history with no human recourse.
Self-hosting email was historically a notoriously difficult task involving a fragile house of cards: Postfix, Dovecot, SpamAssassin, and endless DNS records. But modern open-source mail servers have packaged this complexity into single-command Docker deployments. For teams that value privacy and independence, taking back control of your MX records is practically achievable again.