you can scrape anythink from any web 2.0 website that is publicly known.
you can use scrapebox to do this .
your only get the number of email if it publicly known , that means they dont mind anyone seeing it only.
but your still have to have there permission to contact them even thu it can be scraped or seen.
cold emailing is illegal and classed as spam and harasment .
you can setup a advert campain and get emails legally , via a email opt in form.