Is digital really the way to go?

We have a household in our HOA that currently demands everything be sent electronically. Fine for documents already digitized; not fine for dealing with compliance issues. The problem is, proof of action cannot be obtained via email. We have no way to verify that the email sent went to the person and a simple denial on their part of not received puts the board at risk. Right now, the only way to verify sending something and it being delivered to the recipient's mailbox is USPS or courier service. This adds expense, but, seems necessary when dealing with compliance issues, in order to provide evidence of getting to the address. Registered mail, return receipt requested can be abused by the addressee simply not accepting it, which has happened twice this summer. However, priority mail, registered mail, or courier service at least provides proof that the document got into the mailbox or to the front door and places the responsibility of not getting it squarely on the recipients shoulders. Please, legislators, do not take away the only method we currently have of verifying we are doing what we're supposed to be doing.