Having a website is part of doing business. It helps to establish your company as a legitimate player on the field. Another component of establishing your company is to have an email address that matches the name of the newly created site. If the customer sees a business, or at least what is supposed to be a business, with an email address using the @gmail account extension it diminishes the standing of the company in their eyes. Lets face it, most of us are used to seeing things a certain way in the business world. What we perceive is our reality. If we see evidence of something less than professional during our interactions with a company, it creates doubt. Having a matching domain name/email address established is important when it comes to establishing a firm online presence.