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As I get a couple clients every year asking about this, and although I know it has been suggested in the past, I thought it time to bring the issue up again.
Although SmarterMail does handle the delivery of S/MIME & openPGP encrypted emails it can neither display nor create encrypted emails from within the webmail client itself.
Implementing this would require a Key-Pair Generator on the account settings page, with the ability to upload a Key-Pair as an alternative so that encrypted emails that are received from Contacts can be read within webmail, and having the ability to extract & store S/MIME public keys with Contacts so that emails that are sent to those Contacts can be encrypted (maybe by clicking on a Lock Icon in the TO: field).
Could this please be considered for a future release? I understand that it probably isn't even in the Top 10 most requested features, and pertains to a niche group of users, but it is requested enough by our clients to inquire about this yet again.