"Items
Account Bound Items
Many "Account Bound" heirlooms are now labeled as "Battle.net Account Bound", meaning that they can also be traded or mailed to characters that are on different World of Warcraft accounts under the same Battle.net account.
Mail sent to characters on the same Battle.net account now arrives instantaneously, as it does for the same World of Warcraft account.
Mailing account-bound items to characters of the opposite faction on the same Battle.net account will now correctly translate faction-specific items to their appropriate equivalent."
I saw this in the patch notes but I'm trying to figure out if theres a way to send across servers yet? My main server has all 10 slots full and I wanted to level characters with the new cata quests but not delete anything or pay for a server xfer to open a character slot.