I am still having this issue, receiving e-mail on my old mail address.
Reached out to support twice now over the last few months.
It might be a waiting game.
However, if anyone stumbled on a app-interaction that worked persistently, let me know.
Unsubscribing does not seem to work. (Also not exactly what I want: "Be the last to know"-flow.)
I second the idea about more control, for example, I don't need bunq's invoice to be received on more than one address. (This is a independent issue from the old-address issue.)
A lot of e-mails received on the old are about card-limits, interest, cash-back or creating a digi-card etcetera.
Just feedback about the latter: I know, I was there, I pressed button that made that happen; no need to e-mail about it.