Earlier quoted context omitted.
Yes, if you make it Open Source and possible to self-host it goes from DOA to definitely possible. Would have to explore more, like how it's written, the community around it, etc... before I really commit. Hopefully you can still make a living. I suspect "open source + commercially hosted" is a good model for something like this?
You are asking him to do a ton of work and commit to never charging you for anything on the off chance that you might condescend to use his software. It seems like it would be easier for you to just not evaluate new mail clients.
Thank you so much. I'm so happy that you understand as it can be difficult for a creator to explain such things :)
I really appreciate it!