This is a matter of perception.
SPAM to me is when I get Viagra crap to my junk box.
If I have a website, a contact page, and an email address listed on the whois records, and someone contacts me for an AD inquiry.. if take it as an inquiry not spam..
And if he contacted me 25 times (It happened.. I have had projects of my own), Just delete..
But thats very personal.. again perception..I understand ur point of view..