Besides Thunderbird, is there any good desktop mail client for Windows that doesn’t involve uploading mail to a cloud first?
Mailspring
Have you tried the Thunderbird redesign yet?
There is also Mailbird (not FOSS, costs money and has some weird NordVPN-like fake sales, but the app seems somewhat competent) and Mailspring (partly open source but afaik not completely, built with a MacOS-esque UI but works for Windows and Linux as well).
What do you mean by uploading to the cloud first? Any email goes over the internet
Are you saying that Mozilla keeps copies of your emails on their own servers?
🤨
No, I am saying that OP is looking for an alternative client, which also doesn’t upload their emails. For example, mailspring would be a bad recommendation because, as far as I know, it uploads your email to their server
Thunderbird.