If you are suddenly unable to send or receive messages, your Hotmail (now Outlook.com) account or a specific sender has likely been blocked. Microsoft uses automated filters to protect users from spam and security threats, but these systems can sometimes flag legitimate activity.
If you still have an old email from the blocked sender in your Junk folder: unblock email hotmail
Find the address you want to unblock and click the next to it. Click Save . Using the Safe Senders List If you are suddenly unable to send or