Top 12 Open-Source Alternatives to PowerMTA

Product categories

Calendar Email Email Clients Email Delivery Email Management Email Marketing Email Newsletters Email Service Provider Enterprise Communication MTA SMTP Server Self-hosted Email

Summary

The top open-source alternatives to PowerMTA are mailcow, Mail-in-a-box, and Exim. 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.

mailcow Landing Page
1

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
2

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
Exim Landing Page
3

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
iRedMail Landing Page
4

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
WildDuck Landing Page
5

WildDuck

Self hosted modern mail server
Pricing:
- Open Source
#Email #Self-hosted Email #Email Service 8 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
OpenSMTPD Landing Page
7

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
Roundcube Landing Page
8

Roundcube

Web-based IMAP email client
Pricing:
- Open Source
#Email #SMTP Server #Email Clients 16 social mentions
Haraka Landing Page
9

Haraka

Open source SMTP server written in Node.js
Pricing:
- Open Source
#Email #SMTP Server #Self-hosted Email 9 social mentions
Postal Landing Page
10

Postal

Open source mail delivery platform, alternative to Mailgun or Sendgrid
Pricing:
- Open Source
#Email #Email Marketing #Transactional Email
Squirrelmail Landing Page
11

Squirrelmail

SquirrelMail is a standards-based webmail package written in PHP.
Pricing:
- Open Source
#Self-hosted Email #Enterprise Communication #Email 3 social mentions
Rainloop Landing Page
12

Rainloop

RainLoop is a web based email client.
Pricing:
- Open Source
#Email #Email Clients #Email Management