One of my friends, Michelle Drolet fom Towerwall, Inc. just posted an interesting article about Email Spoofing and how the Sophos Product Reflexion Total Control can help prevent this issue.
You can find the entire article here.
Reflexion Total Control provides quite a few ways for dealing with controlling SPAM and other email problems. Take a look at a quick list of features here. To purchase, find out more on the product or to have us setup a trial be sure to contact us.