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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.
If you only need the feature to forward emails from a bunch of mailboxes on custom domains, https://simplelogin.io for $30 per year might work for you.
There was a post here not long ago about this project. https://github.com/sfindeisen/mkhost I have not yet looked at it but it claimns to be a lean mail server only.
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.