3 self-hosted Outlook alternatives

Outlook is a popular proprietary tool in the mail servers space. These open-source apps let you replace Outlook with software you host and control yourself.

Best self-hosted Outlook alternatives

EasyMedium

binarysource

Mailspring

Mail Servers

Cross-platform desktop email client

Replaces Outlook, Apple Mail

★ 17.7k Easy setup GPL-3.0

Himalaya

Mail Servers

Modern command-line email client written in Rust

Replaces Mutt, Outlook

★ 7k Medium setup MIT

aerc

Mail Servers

Efficient terminal-based email client

Replaces Gmail, Outlook

★ 3.3k Medium setup MIT

Compare Outlook alternatives

aerc vs Himalaya
aerc vs Mailspring
Himalaya vs Mailspring

Switching from Outlook

Moving off Outlook means trading a managed subscription for a service you run yourself. The payoff is ownership: no per-seat pricing, no vendor lock-in, and full control of your data. Start with the option above that matches your setup-difficulty comfort level — every app links to a detailed specs page and head-to-head comparisons.