OpenSMTPD

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

8 Alternatives To OpenSMTPD

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Agent

Book trusted and verified models and photographers

BulkMTA

BulkMTA is Commercial Mail Server Similar to PowerMTA.
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Courier-MTA

The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open…

Exim

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

Open source SMTP server written in Node.js
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MailEnable

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.

NikaMail

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

PowerMTA

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