I keep getting this error and don't know how to fix it since there is nothing in my outbox!  This started yesterday. 

Can anyone help me?   

I've already tried to report windows live but that didn't work. 

CielK 

An unknown error has occurred.

Subject 'Communicatons meeting'
Server Error: 554
Server Response: 554 5.2.0 STOREDRV.Submission.Exception:InvalidRecipientsException; Failed to process message due to a permanent exception with message Recipient "*** Email address is removed for privacy ***" isn't resolved. All recipients must be resolved before a message can be submitted. InvalidRecipientsException: Recipient "*** Email address is removed for privacy ***" isn't resolved. All recipients must be resolved before a message can be submitted. [Hostname=BN6PR20MB1474.namprd20.prod.outlook.com]
Server: 'smtp.live.com'
Windows Live Mail Error ID: 0x800CCC6F
Protocol: SMTP
Port: 587
Secure(SSL): Yes