@ stottie
Let me know the following info so I can fully investigate:
a. What’s your e-mail address?
b. What’s your friend’s e-mail address?
c. Did you also encounter this issue when forwarding or sending newly composed messages?
d. Have you confirmed from your friend that his e-mail provider doesn’t have issues receiving messages from Hotmail users?
e. If you received a failure of delivery notification, post an unedited copy here.