Yellow Letter Campaign Issues

[Bobby Jobs]

Hey BP, 

I recently kicked off a yellow letter campaign for absentee owners in my local market. This is not my first time mailing to this list. The last campaign with this particular list yielded a 10% response rate and only a few were returned to sender. This time i received 0% response rate and a Vast majority of the letters actually came back as return to sender. Once looking over them i realized that the mailing addresses were wrong. My issue is that a lot of these returned letters should be addressed to the absentee owners actual mailing address and not the subject property address. Has anyone ever had this issue with Yellowletters.com before?

All help is appreciated, Thanks.