A document served electronically or by post is taken to have been served:
(a) if the document was sent electronically--on the next business day after the document was sent; or
(b) if the document was posted to an address in Australia--on the day by which the document would be delivered in the ordinary course of the post; or
(c) if the document was posted by airmail to an address outside Australia--on the 28th day after posting.