In March, the California court made a new ruling about email sender identification that now has marketers across the U.S. scratching their heads, wondering how to modify their campaigns to stay out of the legal fire.

This new law is all about discouraging the sending of promotional emails that contain false or misrepresenting header information. It strictly demands that commercial email advertisements (in other words, email sent specifically to sell a product or advertise a service) must include a domain name which is registered to the sender in the "from" line of the email, or the name of the sender or marketer on whose behalf the email was sent.