Exim

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

17 Alternatives To Exim

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…

Dovecot

Dovecot is an open source IMAP and POP3 email server for Linux/UNIX-like systems, written with…

EmailSuccess

EmailSuccess is an advanced MTA built to handle the most critical reliability, performance, security, and deliverability requirements.
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Haraka

Open source SMTP server written in Node.js

Mail-in-a-box

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.
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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.
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Mailgun

A set of powerful APIs that enable you to send, receive and track email from your app effortlessly whether you use Python, Ruby, PHP, C#, Node.js or Java.

Microsoft SMTP Server

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

NikaMail

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

OpenSMTPD

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

PowerMTA

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

Zimbra

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.

Zimbra Collaboration Suite

Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more.

iRedMail

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

msmtp

msmtp is an SMTP client.
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qmail

qmail is the name of an advanced level of mail transfer agent for the UNIX based operating systems.