Having a feature in Constant Contact that allows us to compare list and/or apply some type of rule or filter would be great. Most times we send out campaigns/newsletters that require registration, it would be helpful if we could filter out those who have registered without permanently removing them from the list, so that we don't continue to send them the same campaigns/newsletter. For example a rule or filter could be I want LIST A, except for those who are also on LIST B.   I know several people have made this suggestion but it doesn't seem like its been implemented, and I called to double check. ... View more