Ok , niggling problem here. I received a mail from a trusted source yesterday, and it asked for a "read receipt" so i clicked ok. The receipt seemed to send but it keeps trying to send it as if it didn't go. It is not in my outbox so can't delete it. It keeps popping up this error every 30 seconds unless i close down outlook. Task 'Yahoo - Sending' reported error (0x800CCC0F) : 'The connection to the server was interrupted. If this problem continues, contact your server administrator or Internet service provider (ISP). The server responded: 553 From: address not verified; see http://help.yahoo.com/l/us/yahoo/edit/alternate_email/index.html' it will still send and receive emails but seems to stick on this receipt, so how do i cancel the sending of this specific one.