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Postfix might be a bit more popular than Axigen. We know about 1 link to it since March 2021 and only 1 link to Axigen. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I am the CEO of Axigen (axigen.com) and we have finally finished the complete process to have our trademarked logo published with a valid corresponding VMC certificate as a BIMI DNS record. Source: over 2 years ago
Read the documentation on postfix.org and/or buy one of the many available Postfix books (it really helps to understand the Postfix philosophy). Source: about 3 years ago
mailcow - An open source mailserver suite.
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
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.
hMail Server - hMailServer is a free e-mail server for Microsoft Windows.
Exim - Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
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.