When you get a notice back from Postmaster, it usually means one of several possible things: 1. The email address you sent it to no longer exists. 2. You made an error in the address and the Post Office can't find it. 3. The system which handles that end of the delivery is down and the email cannot be put through to its destination. 4. CCN couldn't send it because its mail queue was full from a system error. Try resending the message and see what happens. Contact Userhelp for further instructions if the email fails again.