Best Open-source Mail Servers & Relays tools

Explore curated open-source tools in the Mail Servers & Relays category. Compare technologies, see alternatives, and find the right solution for your workflow.

9 projects · Page 1 of 1

Tuta

Secure email with seamless end-to-end encryption across devices

Mail Servers & Relays

Stars: 7,853
License: GPL-3.0
Last commit: 21 days ago

TypeScriptActive

Haraka

High-performance Node.js SMTP server with modular plugin architecture

Mail Servers & Relays

Stars: 5,614
License: MIT
Last commit: 22 days ago

JavaScriptActive

Plunk

Self-hosted email platform powered by AWS SES

Mail Servers & Relays

Stars: 5,369
License: AGPL-3.0
Last commit: 22 days ago

TypeScriptActive

Mailu

Fully featured Docker‑based mail server that's simple to deploy

Mail Servers & Relays

Stars: 7,455
License: —
Last commit: 23 days ago

PythonActive

Maddy

Composable all-in-one mail server replacing multiple daemons

Mail Servers & Relays

Stars: 6,065
License: GPL-3.0
Last commit: 1 month ago

GoActive

useSend

Self‑hosted email platform delivering reliable, low‑cost SES mail

Mail Servers & Relays

Stars: 4,609
License: AGPL-3.0
Last commit: 1 month ago

TypeScriptActive

Zero

Self-hosted AI-enhanced email client with unified inbox

Mail Servers & Relays

Stars: 10,765
License: MIT
Last commit: 3 months ago

TypeScriptActive

Mail-in-a-Box

One-click, self-hosted email server that just works

Mail Servers & Relays

Stars: 15,386
License: CC0-1.0
Last commit: 3 months ago

PythonActive

Go-Guerrilla

Lightweight SMTP server for high-volume email reception in Go

Mail Servers & Relays

Stars: 2,959
License: MIT
Last commit: 2 years ago

GoDormant