Your e-mail provider protects your messages (sent/received) from eavesdroppers, using encryption. It applies the latest technologies available, assuring the identity of the parties with which interacts.
Your email provider cannot distinguish between messages received from legitimates sources from messages received from not legitimate ones (spam and phishing messages are usually sent from not legitimate servers). Moreover, it does not protect against impersonation attempts on its users.
Your email provider provides a minimum support to integrity of messages. This score can also reflect a deployment-in-progress of the required technologies to provide integrity.