You have kind of explained the buiding manager’s dilemma in your question.
Unlike the strata manager, the building manager may not have right of access to owners’ and residents’ details, especially not email addresses. So what is he or she supposed to do if you need to be made aware of something that’s happening in a building, especially in an emergency, and neither the strata manager nor the secretary are on hand to provide a conduit.
It always perplexes me when people get shirty about unwanted emails from neighbours being an “invasion of privacy”.
Where’s the invasion? If you get an email from someone and you don’t want contacting you, flag them as “spam” and you’ll never see them again unless you go looking for them.
Too little communication is a much bigger problem in strata than too much.