Is This A Legal Way To Build My List?

Hello everyone,

I am new to all of this and I wanted to know if this is a legal/ethical way of building my mailing list.

What I want to do is collect names and addresses of website owners to mail my offers to. NOT email addresses, but actual physical mailing addresses.

I know that you are not supposed to gather information from the whois database (or can you?), but what if I went website to website and gathered any business address that is listed on the site?

Thanks in advance, Marvin!