Ladies and gentleman, we have a solution. First, you can accomplish this using tags, but that feature is only available if you have less than 10,000 contacts. For those who have more than that, here are test steps to send to List A, but exclude those people who also appear on List B: Copy List A, creating "List A to Be Filtered" Go to contact management, Select List B Click select all Click manage lists Click remove from lists, Then in the pop up, I click on "List A to Be Filtered", and click on remove. Send to "List A to Be Filtered" Do a happy dance.
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