Solved! Go to Solution.
If you're not working with a CRM, you can generate alert emails from the corresponding campaigns/programs instead of from a triggered scoring program. You could have it so that if they take a certain action AND their score has reached the threshold, send the email. Although this would mean sending an email per campaign, it is a decent workaround given your situtation. Mark's suggestion is also good, but would only capture their most recent activity.
If you are using a CRM, sales insight is your best bet to solve this.