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.).
To learn more, see my blog posts:
How email service providers for blasts and/or newsletters work
Ways to collect email addresses from potential customers
What to write in your email blasts and how to write it
My favorite third-party bulk email service providers