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https://www.postbox-inc.com/ is quite good. It is commercial software based on the source code of Thunderbird.

I just took a look at PostBox and it looks great. Unfortunately, on their Add Ons page (https://www.postbox-inc.com/add-ons) they only list Enigmail 1.2. Enigmail is up to version 1.9.x.

IMHO, that's a pretty important add on to keep current.

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