BulkMTA
BulkMTA is Commercial Mail Server Similar to PowerMTA.
18 Alternatives To BulkMTA
Courier-MTA
The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open…
EmailSuccess
EmailSuccess is an advanced MTA built to handle the most critical reliability, performance, security, and deliverability requirements.
Exim
Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
Haraka
Open source SMTP server written in Node.js
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.
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.
Roundcube
Web-based IMAP email client
Squirrelmail
SquirrelMail is a standards-based webmail package written in PHP.
Zimbra Collaboration Suite
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more.
esmtp
esmtp is a user configurable relay-only Mail Transfer Agent (MTA) with a sendmail compatible syntax.
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.
sendEmail
sendEmail is a lightweight, command line SMTP email client.