Mad Dog, I'd also like to add that I don't consider email marketing a particularly good option for lead generation. Because of its intrusive nature, many people object strongly to receiving uninvited emails, even if they are perfectly legal as explained in my post above. In fact, you might find in some cases that people will point blank refuse to have anything further to do with your business simply because they didn't opt in to receiving your emails.
So, you might find your email has a negative impact on the reputation of your business.
Also, if the email addresses you send to are not from your own opted-in database, they could only otherwise be bought-in emails from a data supplier. This is fraught with its own problems, not least of which you can expect the response rate to be tiny.
As a possible alternative, do you have links with any other businesses who have a similar customer profile to your own? If so, I'd suggest you set up a joint venture where your products are featured in their email marketing, and vice-versa.
George