I can receive and read emails without issue.  However, I can not reply to received emails, nor can I send new emails.  I have the same problem whether accessing my account through a web browser or my Windows phone.

If I try to send/reply, I almost immediately receive a reply from "*** Email address is removed for privacy ***" with the subject "Delivery Status Notification (Failure)".  The body of the reply states: "This is an automatically generated Delivery Status Notification.  Delivery to the following recipients failed."

This same message is received no matter the addressee.  Please help!