You can not send items to characters on other realms. They have to be on the same realm as the sender. They can now be on other Wow accounts though as long as they're on the same Battle.net account, that's what's changed in 4.1.

This has been addressed by a rep in the Customer Service forum here: http://us.battle.net/wow/en/forum/topic/2416207644#8


Think I answered my own question