I may need a little advice on choices available, apart from obvious ones like Thunderbird (which maybe overkill for what I want?), but feel free to comment on that too if you want, AND any decent Personal Email Alternatives...?   I can kick things off by what seems to be a good find here, and believe me, I've been looking hard at what's out there in the last 3 days in particular.. (for my & indeed  if you choose, your own personal use)   https://www.claws-mail.org (FREE -