I hope this holds. There have been several such migrations in the past, and they didn’t last. Seeing as it is just email and not the entire OS/software landscape, it will probably hold.

I have a Fairphone 5 with eOS, and I’m happy. Their service is painfully slow, but otherwise professional and reliable. You can run into headaches when flashing eOS if you are not super-cautious (dm mefor details if you like), but the instructions are good, and you can also buy various phones direct from Murena with eOS already installed.