Sandra, I don't think is makes a difference what the reason is the condo owner doesn't or won't receive email. I believe there is a line somewhere in the Bylaws requiring all official notifications be delivered by USPS. I also believe an exception was made during the pandemic and I don't know if its been rescinded.

Your safest course of action is to carefully read your Bylaws and House Rules to see if there is any explicit wording on not requiring USPS delivery. To be totally safe, it's a simple question you can ask your attorney.