Just got my insurance renewal and it now includes an endorsement that excludes: Distribution of Material in Violation of Statutes
It excludes any liability coverage concerning email, faxes, phone calls, or other methods of sending information. So I'm guessing the insurance industry has been hit with the anti-everything acts. I personally would make sure you have permission to fax.
I've done the unsolicited proposals Ron suggests. I always call asking if I can send some information on maintenance services. Never had a refusal. I put the person giving permission in my contact log. May be overkill but the Indiana AG has a thing for this.
By the way they have worked very well for me.