We use MS O365 for email. We've created a rule that encrypts email if it says "Encrypt:" in the subject. However, most users are set to autosave sent files, as that is the default. The files saved in the "Sent" folder are not encrypted, which is a HIPAA violation among others. How can I make it so that it doesn't save these encrypted files, but does save other Sent messages? We don't want to just turn off autosave sent files