Be careful sending out email newsletters. Not all email readers are html (web) compliant or has that feature turned on. Ensure that your message contains both an html and and plain text version, and the coding to tell which one needs to be opened.
66.8% prefer html formated email
22.7% prefer plain text
10.5% have no preference

- "Survey of E-Mail ormat preferences and Programs, Dr. Ralph Wilson, April 2003