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by st3fan 3403 days ago
Not free, but Postbox is pretty great. It is a continuation of Thunderbird. By former Thunderbird engineers if I am not mistaken.

https://www.postbox-inc.com/
1 comments
asymmetric 3403 days ago
Might be pretty great but it's Windows/macOS only, so not sure how much of a continuation of thunderbird it can be considered.
link