The recipient's mailbox is full and can't accept messages now.
Email is bouncing from icloud.com with the message:
The recipient's mailbox is full and can't accept messages now.
With system preferences I check icloud and it says I have 400+ megs available.
Contact apple support requires a serial number. I looked on the back of icloud and could not find one. So posting here is our only choice. (yes, tongue firmly in cheek.)
Thahks,
Mike