I was trying to send a message to all but 50 of my contacts; the 50 share a tag. I called, and the person I worked with was extremely helpful and found a back-door solution. Very complicated and time-consuming. And definitely something the average user, I think, would think about doing.
How about a feature when you 'narrow the list' of recipients? In addition to selecting recipients by tag, how about excluding recipients by tag?
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