Postcard Mailing; Send to Tax Address listed as Mortgage holder?

I'm doing my first set of postcard mailers. I identified the first 50 properties in my area to mail to.  After looking up the tax mailing address for them, I noticed a few were for "CoreLogic" in TX.  My online search says CoreLogic is not a mortgage holder, but a data company...am I wrong?   In either case, being the tax holder, should I send to these, or remove from list?  And furthermore, for any tax address that's listed as a mortgage provider...send or remove?