I agree- this is absolutely needed and would make emailing an even easier process. It would be helpful if I could just make a new segmentation of contacts by saying they are part of List A, AND they are NOT part of list B. My specific issue is that I want this email to go to everyone in a specific industry which I made a custom field for (list A), but I don't want it to go out to the people who are already signed up to attend our webinar (list B ). If Constant Contact customers have been asking for this for years...could you make it happen?
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