KP’s right; you don’t need a Special By-Law.
You could instead Specially Resolve (i.e. ≥75% of those in attendance at a General Meeting being in favour) to adopt the following Model By-Law that’s in Schedule 2 of the NSW Strata Schemes Management Regulation (2010);
22 Service of documents on Owner of Lot by Owners Corporation
A document may be served on the Owner of a Lot by electronic means if the person has given the Owners Corporation an e-mail address for the service of notices and the document is sent to that address.
OR
Simply put an identical Motion on the Agenda for your Plan’s next General Meeting, and if there’s a vote in favour on the basis of a simple majority, then instruct your Strata Manager to include a pro-forma request with the next Levy Contributions Invoice for Owners to provide an e-mail address for that purpose.