What's your process for tracking down property owners for "returned or undeliverable mail"

[Tyron McDaniel]

My  last 2 direct mail campaigns are puking UP undeliverable mail, so much so, that I am now forced to start investigating how to track down the owners and see whats going on? Any ideas on handling these...

[Jeff Baillis]

If you are looking for a free service, I usually have the best luck using http://www.zabasearch.com/ when the tax assessor's site does not have any different information.

With Zabasearch you can search by state. Having a middle initial always helps narrow things down as well.

What was the source for the mailing lists you used that had so many outdated addresses?