Electronic Commerce Act 2006 · Updated to 1 Nov 2012 · Part IV · Communication of Electronic Message
20. Time of dispatch
Feedback & supportUnless otherwise agreed between the originator and the addressee, an electronic message is deemed sent when it enters an information processing system outside the control of the originator.
originator
Defined · s 5
“originator” means a person by whom or on whose behalf, the electronic message is generated or sent;