Top 12 Open-Source Alternatives to Sendmail

Product categories

Calendar Email Email Clients Email Delivery Email Marketing Email Marketing Platforms Email Service Provider Enterprise Communication MTA Newsletter Marketing SMTP Server Self-hosted Email

Summary

The top open-source alternatives to Sendmail are Exim, OpenSMTPD, and mailcow. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

Exim Landing Page
1

Exim

Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
Pricing:
- Open Source
#SMTP Server #Email #MTA
OpenSMTPD Landing Page
2

OpenSMTPD

OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with...
Pricing:
- Open Source
#SMTP Server #Email #MTA 2 social mentions
mailcow Landing Page
3

mailcow

An open source mailserver suite.
Pricing:
- Open Source
#Email #Self-hosted Email #Email Service Provider 82 social mentions
Mail-in-a-box Landing Page
4

Mail-in-a-box

Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.
Pricing:
- Open Source
#Email #Self-hosted Email #Email Service Provider 115 social mentions
iRedMail Landing Page
5

iRedMail

A fully fledged, free email server solution, an open source project (GPL v2).
Pricing:
- Open Source
#Email #SMTP Server #Self-hosted Email 2 social mentions
kumomta.com
6

KumoMTA

KumoMTA is the world's first Open-Source MTA designed from the ground-up for large-volume senders. Get a fast, flexible, supported solution.
Pricing:
- Open Source
- Free
- Free Trial
#Email #Self-hosted Email #SMTP Server 1 social mentions
Roundcube Landing Page
7

Roundcube

Web-based IMAP email client
Pricing:
- Open Source
#Email #SMTP Server #Email Clients 16 social mentions
Courier-MTA Landing Page
8

Courier-MTA

The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open...
Pricing:
- Open Source
#SMTP Server #MTA #Email
Dovecot Landing Page
9

Dovecot

Dovecot is an open source IMAP and POP3 email server for Linux/UNIX-like systems, written with...
Pricing:
- Open Source
#Email #SMTP Server #Self-hosted Email
NeoMutt Landing Page
10

NeoMutt

NeoMutt is a command-line mail reader. It's a version of https://alternativeto.
Pricing:
- Open Source
#Email #Email Clients #Calendar 10 social mentions
Haraka Landing Page
11

Haraka

Open source SMTP server written in Node.js
Pricing:
- Open Source
#Email #SMTP Server #Self-hosted Email 9 social mentions
Mailgun Landing Page
12

Mailgun

A set of powerful APIs that enable you to send, receive and track email from your app effortlessly whether you use Python, Ruby, PHP, C#, Node.js or Java.
Pricing:
- Open Source
#Email Delivery #Transactional Email #Email Marketing 11 social mentions