I've been adding new members to an audience group, and I only want to send to those new members and not anyone else in the group. How do I pull out and only send to the people I haven't sent to before?
It's definitely possible to find those newer people and only send to them. Here's how:
1) Go to your Response page, and click on the mailing you previously sent. Click to view those members who received the campaign, then click the button that reads "Save this tab as a segment."
2) That jumps you into a segment containing those people on your Audience page. Copy all members of this segment into a brand-new audience group.
3) On the Segments tab of your Audience page, you'll want to click to create a segment for people who are *in* the audience group of new and old people and *not in* the new group you just created of people who received the previous mailing. Then you can send to that segment of just the new people. Here are the steps for creating that segment.