1. An open source mailserver suite.

  2. IceWarp integrates all communication & collaboration features in one unified solution.

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

  4. MailerQ is a high performance Mail Transfer Agent (MTA) designed for delivering large volume email messages at very high speeds.

  5. NikaMail is a portable, extendable, zero-config email server.

  6. Linux directory, domain, mail, gateway and infrastructure server for SMBs.

  7. turboSMTP is a reliable, powerful, easy-to-use SMTP server that maximizes the deliverability of all...

  8. Soverin is the honest email service that doesn’t sell your data.

  9. Inbox placement solutions from Return Path helps improve email deliverability and increases email marketing ROI.

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

  11. 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.

  12. KerioConnect is a commercial mail and groupware server.