Many businesses try to send out emails/newsletters to their customers and potential customers from their own personal or business email addresses. Big mistake.
If you choose to send out emails on a regular basis, you should use a third-party email service. There are many excellent third-party services to choose from to work with your site.
The third-party email services will give you a whole lot of useful information (which can help convert to sales), and keep your own email address from being viewed as spam by Internet service providers (Comcast, etc.).