Creating Business Newsletters in Publisher

I recently learnt that I can create a business newsletter using publisher and email to all my clients from publisher also. I just sent off my first newsletter but when I opened the email, the content is concentrated on one side of the page only, a wide with of space. Is there a way for me to display my newsletter so that contents are located in the middle of the page instaed of to one side? Thanks much.

I don't use Outlook and there is no way short of editing Office code to use another email client but I notice when I use email preview which opens the document as a web page, that it is shifted left. The only thing that occurs to me is making your publication only 1 page. The space might be a holder for a second page.