MAA members who have MAA mail addressed to their home were a problem. I took the time to look them up in the CML, but a better method is needed. Mailing labels which had work addresses, or even just institution name, would be ideal. I would settle for a list of names for each institution. I only had a couple of snafus, mostly blamed on department chairs.
Small departments are the most unreliable.
In the cases I ran into, I will send to someone else, maybe someone I know. Dept Liaisons suggested sending to them, which is what I likely will do in many cases. I mailed about 1000 copies, and hand delivered about 50. In the end there were only about 20 people who had attended meetings fairly recently who did not have an institutional affiliation. I gladly sent first class to them.