I am looking for an HA-capable open-source email solution

This page summarizes the projects mentioned and recommended in the original post on /r/selfhosted
Communication systems Email Complete solutions imap-server mailcow

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  • Mailcow

    mailcow: dockerized - 🐮 + 🐋 = 💕

    • Mailcow may be what you're looking for. Open source, full featured (including ActiveSync), and they sell enterprise support packages too.

  • wildduck

    Opinionated email server

    • What do you folks think of WildDuck? https://github.com/nodemailer/wildduck

  • 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.

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NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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