now only two things missing to make me choose eM client for production: pgp support and a portabel version. Hard to believe toyota sends their emails unencrypted…
We support s/mime technology which is industry standard for email encryption/signing. We don’t plan to support PGP in near future. In fact there are not so many clients that support PGP out of the box, because s/mime is much more common.
I think it is PKI/X.509/ S/MIME is more common because nobody managed to make (open)PGP/GPG usable out of the box although I had some very good experience with a free version of PGP in the '90s. I would love to see something like that again.