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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I really like hMailServer for Windows. Includes both transport and backend server supporting POP and IMAP clients. Supports proper encryption and SPAM filters. No longer supported but still available.