EmailEngine has all the code public [1], even though it is not open-source but is source-available. Some core parts I even published under the MIT license, like the IMAP client library I built from scratch to serve the special requirements EmailEngine has for IMAP access [2]
My thinking has always been that those who try to hack the license validation stuff and replace the missing build pipeline were never going to be my customers in the first place, so every second I would spend on them is a wasted effort.
My thinking has always been that those who try to hack the license validation stuff and replace the missing build pipeline were never going to be my customers in the first place, so every second I would spend on them is a wasted effort.
[1] https://github.com/postalsys/emailengine [2] https://imapflow.com/