I think email marketing can be a big waste of time and resources. I would consider using email marketing for reaching out to my existing customer base. There was a question earlier indicating how often one should send email to prospects. If you plan on sending multiple solicitation emails, how do you know your email address was not blocked the first time around?
What’s worked and has been successful for me is traditional cold calling. If you have a solid product, can illustrate true differentiation, a well put together presentation, then the odds are on your side. Know your audience and who you need to talk to. Just my two cents. Happy selling.