Unfortunately, Smart Lists aren't built to "center" email assets in this way.
Smart Lists report which leads received an email (any email or specified emails) — but not the reverse, which emails a specified list of leads received.
It's relatively simple to get this data via the API, though. Run an Activity Export job, constrained by a Static List ID and Activity Type Send Email. (Of course I realize I'm probably getting ahead of myself... you do need to be a developer or have one to call.)
But note the Send Email activity is only retained for 90 days. So if you haven't already been exporting data for offline use, you can't get all the emails, no matter what.
In the future, consider using a trigger Smart Campaign to stamp the Last Email Delivered to a field. That would make the exercise far simpler going forward, at least for the getting the most recent.