Postfix Alternatives

Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

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

The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.

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Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.

Sendmail is a general purpose internetwork email routing facility that supports many kinds of...

Web-based IMAP email client

An open source mailserver suite.

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

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.

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

Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.

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

msmtp is an SMTP client.

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