How do I create a segment of recipients who have not received an email within the past nn days? Not just they didn’t click or open or it didn’t get to their inbox — people who didn’t receive a message because a message was never sent to them?
Solved
How to Segment by Last Email Sent

Best answer by kaila.lawrence
Jumping in here to add that
I’d set it up like this:

Hope that helps!
Reply
Rich Text Editor, editor1
Editor toolbars
Press ALT 0 for help
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.