There are usually NPCs around the AH that will allow you to send up to 8 items at a time. You just need the name of the person you wish to send things to.
For example, in Bastok Markets, there are 3 NPCs right outside the AH, The two on the outside are the people that you talk to to send an item. The NPC in the middle is there to help answer questions about the AH.
Safe Travels.