Thank you for reaching out to us. That is a great question! So there are quite a few ways that you can compile that information about your contacts. The one that I recommend is using our Segments feature in your contacts that will put contacts into a new list based on the criteria you choose! For example, you can tell the system to pull the contacts who opened the last 10 emails from a certain list and have them all be placed in a new contact list for easy use. Please let us know if you have any more questions!
You are correct, at this time our segmentation tool does not include a "opened all of the last 5 emails" feature.The good news is you can still accomplish this through the options that are available! I would suggest choosing the option of a specific email. Using this tool you can pull from the last individual 5 emails. Once you get these results you can then combine them all into one contact list.