Thank you for reaching out to the Community! The email address in your footer matches the from address of your campaign. In fact, this is something you can update in the edit mode of any draft campaign, or sent campaign you copy. This From Email is contained in the header of all your emails. Clicking anywhere in the header will allow you to choose a different verified email address from the drop-down menu.
Once you make this change in your header, you will see it update in your footer as well.
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