Top 20 products relevant to Email, Self-hosted Email, and Email Service Provider

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.

Open Source

An open source mailserver suite.

Open Source

A fully fledged, free email server solution, an open source project (GPL v2).

Open Source

Axigen is an integrated email, calendaring & collaboration platform, built on a Linux mail server technology.

SOGo is groupware server with a focus on scalability and open standards.

Open Source

hMailServer is a free e-mail server for Microsoft Windows.

Full featured email server built in docker with free plan.

Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface.

Mailu is a simple yet full-featured mail server as a set of Docker images.

PowerMTA is an industrial-strength software for high-volume email delivery.

SmarterMail is a next generation email management server that is offering several business collaboration and communication features as well.

Postfix Admin is a web based interface used to manage mailboxes, virtual domains and aliases.

MailEnable is a Windows based mail server and email server program that is packed with the state of the features and functions like antivirus and spam filtering system, webmail management system, cardDAV, CalDAV and much more.

Open-Xchange Server 6 is the most advanced Linux based Groupware solution f.

Self hosted modern mail server.

Open Source

qmail is the name of an advanced level of mail transfer agent for the UNIX based operating systems.

A personal server for owning your email and more.

Xeams is a secure and powerful mail server for that includes a powerful spam filtering engine that...

Simple, easy and secure mail server with a convenient and simple interface.

ArgoSoft Mail Server is a best in the class webmail server that is basically the suit of multiple servers, FTP server and various other forms of servers that allow the users to manage all of their servers.