You can't hide.
Part of the training I give relates to calling people for data cleansing purposes. You get to speak to some very strange people at businesses with even stranger ideas about discussing their company! Today there was a prime example of the silliness of people and how I train my colleagues to overcome their blocking tactics.
Having gone through most of the address details.
Telesales: "And could I just take an email address for Malcolm?"
Prospect: "We don't give out email addresses."
Telesales: "OK, could I have your companies generic address then?"
Prospect: "As I said we do not give out email addresses!"
Telesales: "Oh OK, it's not a problem, I'll get the address from your website."
Prospect: "What? Wait? What? Oh OK it's.........."
Nothing is secret anymore.