Zimbra is an enterprise-class email, calendar, and collaboration solution built for the cloud, both public and private.
Starting at $6 per mailbox per year
Best Postfix Alternatives ranked by AI · updated Aug 2026
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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 SMTP delivery and is widely deployed by organizations and hosting providers.
Top 6 Postfix alternatives
Microsoft Exchange Server is a popular email and calendaring server software developed by Microsoft.
Pricing varies based on the edition and deployment model.
Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
Sendmail is a general purpose internetwork email routing facility that supports many kinds of mail-transfer and delivery methods.
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.
OpenSMTPD is a free and open-source server-side SMTP implementation. It aims to be simple to set up, reliable, and secure.
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