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Apache James is a Java-based mail server. It provides a rich set of features for handling email communication.
Postfix is an open-source mail-transfer agent used to send, receive, and relay email on Unix-like systems. It is designed for secure, reliable...
Free, open source
Dovecot is an open-source IMAP and POP3 email server for Unix-like operating systems.
mailcow is a modern mail server suite based on Dovecot, Postfix, SOGo, and other open-source software. It provides a complete email solution...
Zimbra is an enterprise-class email, calendar, and collaboration solution built for the cloud, both public and private.
Starting at $6 per mailbox per year
iRedMail is a full-featured mail server solution that supports email services like SMTP, IMAP, POP3, and webmail.
Free and Paid versions available
Modoboa is a mail hosting and management platform including a modern and simplified web interface for user and domain administration.
Free and open-source
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