How to opt out of physical mail about using the equity in my house

I'm already opted out through the credit bureaus at https://www.optoutprescreen.com/

But since Rocket Mortgage bought my mortgage, they keep sending me mail about borrowing from the equity in my house, multiple times a week.

Is there a way to opt out? I'm signed up for everything paperless, but they still insist on filling my mailbox with these offers.

First world problems, I know.