You may receive important communications from the USPTO. If via regular mail, they will have an official USPTO seal. If via email, they will always come from an address including "@uspto.gov." Ensure that emails from the USPTO are NOT treated as spam by adding the USPTO to your "Safe Senders" list. Also, if your email address changes, you must update the USPTO records with the new address. You should monitor the status of your application at least every 3-4 months after any filing to avoid missing any critical filing deadlines.