1. Simple and easy-to use PHP e-mail client.

  2. Configure SMTP e-mail in IIS when you want to deliver e-mail messages from your site.

  3. A small Mail Transport Agent (MTA), designed for home and office use. Part of ...

  4. OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with...

  5. msmtp is an SMTP client.

  6. sSMTP is a simple MTA to deliver mail from a computer to a mail server.

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

  8. Web-based IMAP email client

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

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

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

  12. Increase security, evolve your datacenter, and innovate faster with Microsoft Windows Server, the cloud-ready operating system.