Top 6 Open-Source Alternatives to Microsoft Exchange

Microsoft Exchange

Secure Email Gateway.

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Product categories

Cyber Security Email Email Clients Email Management Email Security Email Service Provider Enterprise Communication Enterprise Content Management Hosted Email Online Database Realtime Collaboration Self-hosted Email

Summary

The top open-source alternatives to Microsoft Exchange are Tutanota, SpamAssassin, and Mail-in-a-box. 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.

Tutanota Landing Page
1

Tutanota

Get your encrypted mailbox for free.
Pricing:
- Open Source
#Email #Enterprise Communication #Email Clients 180 social mentions
SpamAssassin Landing Page
2

SpamAssassin

Use this program to "Unspam" your mailbox(es).
Pricing:
- Open Source
#Email #Email Security #Cyber Security 6 social mentions
Mail-in-a-box Landing Page
3

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 #Email Service Provider #Email Clients 122 social mentions
iRedMail Landing Page
4

iRedMail

A fully fledged, free email server solution, an open source project (GPL v2).
Pricing:
- Open Source
#Email #Email Clients #SMTP Server 3 social mentions
Rainloop Landing Page
5

Rainloop

RainLoop is a web based email client.
Pricing:
- Open Source
#Email #Enterprise Communication #Email Clients 1 social mentions
WikiSuite Landing Page
6

WikiSuite

While Wikipedia is the broadest unified body of knowledge, WikiSuite is the most comprehensive and integrated Open Source enterprise solution.
Pricing:
- Open Source
- Free
#eCommerce #Email #Online Database