I already use "data/remove duplicates", but have come up with a new dilemma. I'm using slightly outdated lists of email addresses to market for my clients, and constantly receive a list of "bounces" after I send out a number of emails. For example, I send out 1,000 emails, and 100 bounce. I now have two lists: the original 1,000 contacts, and the 100 bounces. Is it possible to remove the 100 bounces from the 1,000 list, leaving 900 valid email addresses without having to do it with Ctl-F, one at a time?