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OpenSMTPD
This is official OpenSMTPD Portable repository. Forks, pull requests and other contributions are welcome!
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
I do recommend a pre-made solution, given that managing all the components of a mailserver can be very time consuming (spf, dkim, spam, etc). My choice is mailcow https://mailcow.email. Free, dockerized, comes with rspamd, a powerful webgui, easy single command upgrades and sogo (webmail/calendar/contacts). Obviously based on open-source software. I've been running it for 3 years. Never a single issue, it's just fantastic.
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Hence, a higher number means a more popular project.