How to use "was sent sales email"
I created an email blast with three emails spaced three days apart. What's the best way to prevent emails 2 or 3 from sending if they responded to the 1st or 2nd email and the activity is being documented in Salesforce? I tried testing by sending an email to a test contact from salesforce, then setting up the smart list as "was sent sales email / subject is any / date of activity on or after 10/19/2015 / sent by [my email address] and it affected 0 leads. Maybe my understanding of what a "sales email" is wrong?