I think you're looking for triggers. In your example, you would use a Clicks Link in Email trigger to listen for the click action, and then send out an alert when it happens.
On your form embed code, you can swap out the '//app-****.marketo.com' in the loadForm call with '//<your landing page domain>' which should remediate this issue.
Your server is trying to use the querystring for navigation and since there's no page corresponding to that string, it fails. You'll need to get in touch with whomever owns your se...