A list is a snapshot from the day you pulled it, and a property can change hands between the pull and the mailing. So the first check is the deed record, and it comes first because a record that fails it makes the other checks moot.
On PropertyRadar's property and owner profile, Purchase Date shows when the most recent change of ownership was recorded, and the Transactions tab shows the current owner's recorded transactions. Its Title Search link opens the county recorder's website. Look there for anything recorded on the parcel after your pull date.
If nothing later is indexed and the latest deed's grantee agrees with the owner on your list, the record goes ahead. If a later instrument appears, hold the record and read the instrument's type, parties and legal description before you decide the list is stale. A later document on the parcel doesn't always change who owns it.
An index search can also miss a recent recording. Harris County's real property search, for one, says a document can take 1 to 2 business days after it is processed for recording to appear. A clean result supports a first contact and falls short of proof of title. A separate answer covers the full lookup for finding the current owner in county records.
While you're on the profile, read Owned By, which is individual, husband and wife, multiple owners, corporate or trust. A letter can go to an entity by name at its mailing address. A call needs a person. For a corporate or trust owner, open the Contacts tab, which lists each contact's name, person type and ownership role, and choose someone to approach.