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Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
Postfix is an open-source mail-transfer agent used to send, receive, and relay email on Unix-like systems. It is designed for secure, reliable...
Free, open source
Sendmail is a general purpose internetwork email routing facility that supports many kinds of mail-transfer and delivery methods.
qmail is a Unix mail transfer agent for sending, receiving, and relaying SMTP email. It emphasizes security through process separation and a...
Microsoft Exchange Server is a popular email and calendaring server software developed by Microsoft.
Pricing varies based on the edition and deployment model.
PowerMTA is an advanced email delivery solution that offers high performance and reliability for sending large volumes of email.
Custom pricing
Microsoft SMTP Server is a mail server that allows you to send and receive emails using the Simple Mail Transfer Protocol (SMTP)....
Pricing varies based on Microsoft Exchange Server edition.
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