Hey @Micaela Wright,
Marketo doesn't have an equivalent default field (though you could mimic this moving forward with a data management process if you wanted to).
To achieve a similar outcome, there's a range of typical marketo filters you could typically include in a smart list, including:
- Lead score is at least X
- Has opened any email in the past X months (+ at least X times if desired)
- Has clicked any email in the past X months (+ at least X times if desired)
But there's an important disclaimer here - you've just moved over to Marketo, and this is your first round of newsletters. You might not have lead score in place yet, and might not have data regarding opens and clicks in Marketo - and probably wouldn't be able to use these typical email filters anyway, because it's most likely that what you're looking for is information that was related to activities in Hubspot, not in Marketo.
Long story short, I suspect this will turn around to an internal business question - did you bring that data over to Marketo? If so, what fields did you map to? If not, can you source it anywhere and supplement it?
Hope that helps.