Doesn't need to be a move back to Mozilla Suit (today named Seamonkey). They can offer web-services for this (just cooperate with an existing Provider like fast

Doesn't need to be a move back to Mozilla Suit (today named Seamonkey). They can offer web-services for this (just cooperate with an existing Provider like fastmail), but with trusted privacy features and embedded in the browser with first class-quality-extensions. Or they push thunderbird, the mail-client they brought into the world to just ignore it for such a long time. A trustable privacy-first mail-client with brainless configuration and maybe some useful modern PIM-features would sell well enough to satisfy a price. I mean there are already services doing that, mozilla couild cooperate with them or just push their own weight in the ring.