Notices can be sent electronically but I think they require both a by-law allowing the EC to do so and for the owners to ‘opt-in’.
This is what the Act says about EC notices:
Part 2 Provisions relating to meetings of executive committee
6 Notice of executive committee meetings
(1) An executive committee of a large strata scheme must give notice of its intention to hold a meeting at least 72 hours before the time fixed for the meeting:
(a) by giving written notice (which may be done by electronic means) to each owner and executive committee member, and
(b) if the owners corporation is required by the by-laws to maintain a notice board, by displaying the notice on the notice board.
(2) An executive committee of a strata scheme that is not a large strata scheme must give notice of its intention to hold a meeting at least 72 hours before the time fixed for the meeting:
(a) by displaying the notice on the notice board, or
(b) if the owners corporation is not required by the by-laws to maintain a notice board, by giving written notice (which may be done by electronic means) to each owner and executive committee member.
(3) The notice must specify when and where the meeting is to be held and contain a detailed agenda for the meeting.
(4) A notice may be given to a person by electronic means only if the person has given the owners corporation an e-mail address for the service of notices under this Act and the notice is sent to that address.