There’s been a lot of debate lately about whether Congress should enact anti-spam legislation. No matter what side of the debate you’re on, if your company does email blasts, it’s important to remember that numerous states have anti-spam laws that conceivably might apply to your company.
See http://www.spamlaws.com/state/summary.html for what appears to be a useful summary of state laws and links to the text of the legislation; I don’t know how accurate or up-to-date it is. Other countries and the EU might also have anti-spam laws that could come into play.