I often send out e-mails to clients based on their activity level or frequency.

It would be awesome to have a simpler way to segment these types of contacts.

I.e., contact has opened an e-mail in the last 10/30/60 days. Or contact has opened e-mails 3 times in the last 7/30 days.

If there's an easy way of doing this I'm oblivious to it and would love your feedback.