I had the same message today, I solved it by going to windows mail, clicked on Tools, than on Options, than on Send, and finally under Mail Sending Format I changed from HTML to Plain text. , clicked on apply and OK and that fixed my problem, I was able to receive mail. It was apparently hung up on a very large e-mail I send out earlier. After the send and receive worked I went back into options and changed it back to the way it was earlier and have not had any problems since. Good luck.