> ## Documentation Index
> Fetch the complete documentation index at: https://mintlify.com/awesome-selfhosted/awesome-selfhosted/llms.txt
> Use this file to discover all available pages before exploring further.

# Email - Mail Transfer Agents

> SMTP servers for sending and routing email messages across networks

[Mail Transfer Agents](https://en.wikipedia.org/wiki/Message_transfer_agent) (MTAs) - [SMTP](https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol) servers.

## Full-Featured SMTP Servers

### Postfix

Fast, easy to administer, and secure Sendmail replacement.

* **License:** IPL-1.0
* **Tech Stack:** C, deb

### Exim

Message transfer agent (MTA) developed at the University of Cambridge.

* **Source Code:** [git.exim.org](https://git.exim.org/exim.git)
* **License:** GPL-3.0
* **Tech Stack:** C, deb

### Sendmail

Message transfer agent (MTA).

* **License:** Sendmail
* **Tech Stack:** C, deb

## Enterprise Solutions

### Courier MTA

Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services.

* **Source Code:** [courier-mta.org](https://www.courier-mta.org/repo.html)
* **License:** GPL-3.0
* **Tech Stack:** C, deb

## Lightweight SMTP Servers

### chasquid

SMTP (email) server with a focus on simplicity, security, and ease of operation.

* **Source Code:** [blitiri.com.ar](https://blitiri.com.ar/git/r/chasquid/)
* **License:** Apache-2.0
* **Tech Stack:** Go

### OpenSMTPD

Secure SMTP server implementation from the OpenBSD project.

* **Source Code:** [OpenBSD CVS](https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/smtpd/)
* **License:** ISC
* **Tech Stack:** C, deb

### Haraka

Fast, highly extensible, and event driven SMTP server.

* **Source Code:** [GitHub](https://github.com/haraka/Haraka)
* **License:** MIT
* **Tech Stack:** Nodejs

### DragonFly

A small MTA for home and office use. Works on Linux and FreeBSD.

* **Source Code:** [GitHub](https://github.com/corecode/dma)
* **License:** BSD-3-Clause
* **Tech Stack:** C

### EmailRelay

A small and easy to configure SMTP and POP3 server for Windows and Linux.

* **Source Code:** [SourceForge](https://sourceforge.net/p/emailrelay/code/HEAD/tree/)
* **License:** GPL-3.0
* **Tech Stack:** C++

## Specialized Solutions

### OpenTrashmail

Complete trashmail solution that exposes an SMTP server and has a web interface to manage received emails. Works with multiple and wildcard domains and is fully file based (no database needed). Includes RSS feeds and JSON API.

* **Source Code:** [GitHub](https://github.com/HaschekSolutions/opentrashmail)
* **License:** Apache-2.0
* **Tech Stack:** Python, PHP, Docker