Return mail?

[Joshua Martin]

Hey gang, 

  I was just looking for a bit of advice on how people handle return mail. I've heard on the podcast that certain people really like to hunt these down because there's a higher chance that they're not getting mail from other sources, and you might be the one piece that gets through. So, over the last 6 weeks I've sent out about 1,150 mail pieces (not that high, I know, but we'll get there), and I've gotten about 25 pieces back. 5 are probate leads that I would like to track down, about 15 are postcards (weighing the cost and time of tracking leads for this prospect group), and a few are driving for dollars leads.

  So, if you do track down addresses on return mail, what do you use? I had horrible luck with spokeo about a month ago when I was trying to trace people, and I think I paid for a one time use of intellius which gave me a fresh address, but it turned out to be wrong and the mail piece was again returned. How do you guys go about this, if you do at all?

   Thanks in advance.