I have 16k on our mailing list. Many are on multiple lists. We are wanting to send an email out to those who gave to a certain fundraiser last year. I've given them an unique tag. But we are also wanting to send an email out to everyone NOT tagged with that tag. When adding all my lists, I am able to make sure all with a certain tag are targeted. I would like to do the same but choose all not tagged so those on multiple lists don't receive both. Thanks.
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