stop receiving security alerts

I once administrated https://palmrevision.dk – and I have stopped receiving alerts from there.

But they have a test site now, which seems to be a clone, where my mail still is registered.

I tried unsubscribing from the emails I receive, but it doesn’t work due to password protection of the test site.

How can I stop these alerts, without having to contact the new administrator?

The page I need help with: [log in to see the link]