4 self-hosted Sendmail alternatives

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

Best self-hosted Sendmail alternatives

OpenSMTPD

Mail Servers

Secure and simple SMTP server from OpenBSD

Replaces Sendmail, Postfix

★ 579 Medium setup ISC

msmtp

Mail Servers

Lightweight SMTP client for sending mail

Replaces Sendmail

★ 290 Easy setup GPL-3.0

DragonFly Mail Agent

Mail Servers

Tiny mail transfer agent for outbound delivery

Replaces Sendmail, Postfix

★ 263 Easy setup BSD-3-Clause

Nullmailer

Mail Servers

Simple relay-only mail transfer agent

Replaces Sendmail

★ 199 Easy setup GPL-2.0

Compare Sendmail alternatives

Switching from Sendmail

Moving off Sendmail 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.