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Based on our record, Mailu should be more popular than Postfix. It has been mentiond 4 times since March 2021. We are tracking product recommendations and mentions on Reddit, HackerNews and some other platforms. They can help you identify which product is more popular and what people think of it.
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: Reddit / 4 months ago
I see no one has mentioned Mailu (https://mailu.io/1.7/). It’s a self hosted mail server made up of a couple docker images. I would recommend it based on my use and experience. I’ve been using it for my personal email and for automated no-reply messages in a few projects with no delivery issues. It handles spam with rspamd, sets you up with DMARC, DKIM, has an admin interface, web mail interface. - Source: Hacker News / about 2 months ago
Mail servers and such can be very frustrating to configure and such, I would recommend taking a look at Mailu. It is a preconfigured mailstack (with some options and you could modify some of the configurations) built on top of docker. They have a decent installation guide (the whole setup process itself isn't complicated). - Source: Reddit / 3 months ago
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.
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.
Exim - Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
mailcow dockerized - An open source mailserver suite.
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
Poste.io - Full featured email server built in docker with free plan.