MailerQ is a high performance Mail Transfer Agent (MTA) and a very fast SMTP server, designed to deliver large volumes of email messages at very high speeds. MailerQ is based on RabbitMQ AMQP.
Cost / License
- Pay once
- Proprietary
Platforms
- Linux

Exim is described as 'Message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet' and is a Mail Server in the online services category. There are more than 10 alternatives to Exim for a variety of platforms, including Linux, Self-Hosted, BSD, Mac and Windows apps. The best Exim alternative is Postfix, which is both free and Open Source. Other great apps like Exim are Mail-in-a-box, KumoMTA, Haraka and OpenSMTPD.
MailerQ is a high performance Mail Transfer Agent (MTA) and a very fast SMTP server, designed to deliver large volumes of email messages at very high speeds. MailerQ is based on RabbitMQ AMQP.

NikaMail is a portable, extendable, zero-config email server. It is designed to perform automation tasks, provide access to mailboxes (port 110), serve as a mail transfer agent (port 587) and mail exchange service (port 25). NikaMail supports TLS.




BulkMTA is Commercial Mail Server Similar to PowerMTA. IP Rotation, DKIM, Sender / Receiver Rate limiting.
EmailSuccess, an advanced SMTP Server (MTA) built from the ground up to handle the most critical reliability, performance, security, and deliverability requirements.




A lightweight mail server with SMTP and POP3 support. It mainly used as store-and-forward mail server with POP access to spooled messages or it can be used as a personal internet mail server.
