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That's a great question! While I understand how useful it would be to customize this icon, I apologize customizing this icon is not a feature that is available as it is not a setting that Constant Contact controls. This from icon displays differently depending on the email client and the contact's account settings. You can have an image show as the icon in your personal account through adding the "From Email" address to your contact list and manually adding an image to it.
Hi @BenM589. Yes, if you change the From address in your Constant Contact campaign, the icon in Gmail will change as well if the profile icon was not already updated. Each Gmail address has their own settings.