*Send later* feature? As Thunderbird, possibly with an add-on propose it, but may not have the computer running at the wanted time

[Benjamin-Loison]

Checklist

• [X] I have used the search function to see if someone else has already submitted the same feature request.
• [X] I will describe the problem with as much detail as possible.
• [X] This issue only contains a request for one single feature, not multiple (related) features.

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