Rated 4 out of 5 stars

Από τον/την Χρήστης Firefox 6c8626 στις Ιούν. 16, 2021 · μόνιμος σύνδεσμος

To use Send Later, no OpenPGP key can be associated to the account.

With OpenPGP key associated, draft is saved with encryption by the key.
This makes Send Later fail due to `Encryption compatibility issue`.
Probably Send Later cannot decrypt the scheduled mail by itself.

OpenPGP having been promoted as a standard feature of Thunderbird,
it would be nice if Send Later could handle this
(Though I know considering OpenPGP behavior would be too hard or perhaps impossible).

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Edit on Thu Jun-17-2021 (Reply):

Got it. I'll wait for the Thunderbird update. Thank you!