You have a legal obligation to deliver agendas and minutes so even if you had a by-law requiring people to provide their email addresses you would still have to post them out to the recalcitrants.
Now, I don’t know if this is entirely legal but I think you would get away with it … how about if you made the delivery of documents a line item on your building’s strata levies.
You would want it to be a substantial figure but you allow a discount of that amount for people who registered their email addresses and agreed in writing to that this was an accepted method of delivery.
So, basically you are starting from the point of view that everybody gets their agendas etc delivered and pays, say, $20 for each meeting. However, those who accept emails get a $20 discount.
Or don’t even have it as a line item. Just offer a discount of a substantial amount for everyone who accepts notices by email.
It’s not so much user pays as non-user doesn’t pay. That could work.