Hello,
I am not very familiar with Google's tracking codes, but I can try to help you find out if this is possible within our system. Would the embedded code be tracked through a URL of a clickable link? Or if not, what exactly would need to be embedded in the email?
What Constant Contact does allow, is for you to create a custom HTML email using the API's. You can create dynamic links within this email for each individual contact. You also are able to use the API's to create your own custom sign up form, which would allow you to redirect them anywhere you want after they sign up.
If you have any further questions about this please let me know.
Regards,
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