In the Logos section of Database Settings, logos of file type .jpg, .gif, or .jpg can be uploaded as the default logo for an organization or for any of the following:
Invoices : when a receipt or invoice is generated for a customer in Audience Search, the uploaded image for the product will be displayed at the top.
Deployment Types : when a recipient unsubscribes from a deployment type, the uploaded image will be displayed at the top of the confirmation pages.
and Preference Pages : for Preference Pages created via Email Builder in Deployment Defaults, the uploaded image will be displayed at the top of the page.