The moves come amid intensified lobbying and political maneuvering over the issue. With outrage over spam at fever pitch, Congress is widely expected to pass the first national anti-spam law this year.
The new bill, by Reps. Heather Wilson, R-N.M., and Gene Green, D-Texas, contains broader enforcement powers for federal and state authorities, tighter restrictions on marketers and an anti-pornography provision.
"This is a business that is always looking for the next loophole," Wilson said. "We take out a lot of the loopholes."
Whereas other legislation focuses on spammers that use deception and peddle scams and pornography, Wilson said her bill recognizes that any unwanted commercial e-mail is spam.
So far, key Internet industry groups have not thrown their weight behind any individual bill.