Personal Information on Direct Mail

[Mike G.]

We recently started a direct mail campaign, and ran across the issue of how much personal information to provide to people. In one phone call, they asked for my full first and last name, but I did not want to provide it to them, as I wasn't even sure that they were going to let me see the property. Is this something I am being overly paranoid about, or should I hold firm and not provide them with a last name.