code: def delete_user(self, recipient_email):
          
          emailid_list = self.list_user_emails()
          if recipient_email not in emailid_list:
              raise Exception("User {0} not present!".format(recipient_email))
          else:
              emailid_list.remove(recipient_email)
              self.y = self.decrypt()
              self.encrypt(emailid_list=emailid_list)
docs: Remove user from encryption