Haraka
Open source SMTP server written in Node.js
17 Alternatives To Haraka
BulkMTA
BulkMTA is Commercial Mail Server Similar to PowerMTA.
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…
Exim
Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
Horde
Horde Groupware is a free, enterprise ready, browser based collaboration suite.
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.
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.
Microsoft SMTP Server
Configure SMTP e-mail in IIS when you want to deliver e-mail messages from your site.
Mutt
Add forums and commenting to your site. Unlimited posts, users and traffic, for free. Embeddable, styleable and scriptable.
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.
SendInBlue
Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
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.
iRedMail
A fully fledged, free email server solution, an open source project (GPL v2).
msmtp
msmtp is an SMTP client.
qmail
qmail is the name of an advanced level of mail transfer agent for the UNIX based operating systems.