It's important to understand that the sheer volume of rides turned in make it unrealistic to ask for a status update on one particular ride. It's in a stack somewhere or in a verification team's file. If you sent your ride in via email and received a canned response that it was submitted, they got it. It's very unlikely that any emails sent to the submission email addresses that are not a ride submission would be responded to. That is not what those email addresses are for.
I've never had a ride denied, so I don't know if the IBA notifies applicants when they deny one. In the old days of paper submissions, I would suspect not. In the electronic age, I would hope so, as it's cost free and a contact email address is available to the person making the decision.
The IBA works on a packet system. Send and forget. You send in your submission, get a auto response that it was received, (if sent in via email), then you forget about it until you are notified it is approved and to pay the fee.