I don't think that it is possible to embed a form to an email. You can add a button that leads a form. But the form has to be live. You could hide the web page from google or the navigation if you wish to "hide" the form.
And in outbound as well in realtime you can then create a journey that triggers when someone submits the form. Then an email is send.
Same of course also applies to Realtime journeys.
Hope this helps
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