Since Bitwarden is a security product, there should definitely be an option to have emails sent from Bitwarden (i.e. activity notifications, customer support, etc.) be encrypted with OpenPGP instead of being in plain text. This would help bring security and privacy to the users since their emails from Bitwarden are encrypted.
An idea of how it can be implemented
The user goes to their Bitwarden account settings and click the checkbox that says “I want my emails from Bitwarden to be encrypted.” After clicking the checkmark, the user has the option to import/copy-and-paste their public PGP key. After clicking save, Bitwarden will then send a verification email with a clickable confirmation link that is encrypted with the user’s public PGP key to confirm that the user is able to decrypt the email. If the user successfully decrypts the verification email to click the link, all future emails sent from Bitwarden to the user will be encrypted, unless the user disables it or wants to change their keys.
The user could also send encrypted emails to Bitwarden by importing Bitwarden’s public key into their email client.
Overall, I think this would be a great feature to have and would make Bitwarden stand out from other password managers.