I think Drew makes a great point, but if you're manning the ship alone with a large team, it can be difficult. A lot of it is dependent upon the size of your business (how many reps you have) and how "trigger happy" they are about sending. If you have a larger team, it can get crazy trying to track everything--and you can lose sight of the big picture. If they're/you're sending a lot of emails, we found in the big picture the lead gen ones were more valuable. However, if you're part of a smaller team, then it would make sense to look at the other emails. A lot of this is dependent upon the size of your business and how you operate/sync up with your reps/how many emails you're giving. Also keep in mind that conversion rates (IE if the emails translated into business) vs. open rates (not as valuable/partially meaningless for business purposes) is the ultimate goal in the long run/big picture.