Archived and Closed
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Basically I'm working for somebody who has a shop that rents equipment. He's got mailings to specific groups corresponding to categories of what he rents. So if somebody rents something in category "A", they get added to the group for that category. If they subsequently rent something in category "B", I want to add them to that additional group, but also if they got the previous "A" mailing and thought "Oh, I don't want these mailings any more", I don't want them to start getting mails again just because they rented something else from us.