Avanan allows administrators to exclude Smart Banners from emails sent by specific domains. To do that:
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Go to User Interaction > Smart Banners.
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Click Settings next to the Smart Banners at top left corner.
The Smart Banners Config pop-up appears.

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Select the Exclude sender domains checkbox.
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In the Excluded sender addresses / domains field, enter the required addresses or domain(s) separated by commas.
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Click OK.