Those are personal answers; work emails are always signed by Notes, and encrypted when the recipient has a key available to me. Few of the people that I email on a regular basis have installed email crypto, so there's not much point in even signing the things to them.
I don't put communications into a digital medium if I don't want people to read them. It was useful for a while when we shared organizational but not technical ties with other units, but it's no longer relevant. I don't have security responisibility where it is necessary for individual communications to be verifiably from me in the eyes of third parties.
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