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Are there any self-hosted, modern mail servers (similar to Sendgrid, AWS SES, etc.)?

I have just found this interesting project for Rails after a lot of research:

https://github.com/postalserver/postal

I wonder if there are any other promising projects out there. The idea is to have a scalable service like Sendgrid, Postmark or AWS SES, .... but self-hosted.

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