or you know... don't send email blasts...
i cant see any producer reading a clearly mass emailed email. they are busy enough as it is.
If you want to email a bunch of places, you have to email them 1 by 1. You can copy and paste the same email to all of them if you like, and just replace names or titles and no one will notice, but you send out an email "blast" and you've already lost 90% of your target. You are essentially sending them spam, why should they look at it? If they get an email from a guy, addressed to them, asking them specifically to take a look at said guys work, and consider him for future work they will probably be more inclined to do it. Context is essential.