I would do this, ask him to send out an email to his contacts with your information, a testimonial and a first time client discount for services. This is most important with building a referral list. All three parts in one email.
I have tried this in the past, it failed for the most part but also worked (I did this to 5000 realtors once, I made $1000), but found out I was breaking the CAN-SPAM Act. My email marketing system nailed me on it. Since they caught it, I removed my listings and I was fine, no one reported me as a violator. Most folks are so used to "spam/junk" email that they just delete emails anyway. But many people would be very offended to know that their contact just gave you their list of contacts. I don't think there is a law against him giving it to you, but you want to make sure that you put your best face on those emails.
You got the approval, I would write up a message and ask him to send it out! Way to go on landing that, it's a big deal for 200 contacts.