President Bush has signed legislation aimed at stemming the flood of unwanted e-mails.
In an Oval Office ceremony, the president put his signature on the "Can-Spam Act" -- which authorizes the Federal Trade Commission to set up a list of e-mail addresses similar to its "do-not-call" telephone list.
The bill supplants anti-spam laws already passed in a number of states. It provides both civil and criminal penalties for spammers -- who in rare circumstances could get up to five years in prison.
White House Press Secretary Scott McClellan says unsolicited e-mail is "annoying to consumers and costly to the economy."
Texas Congressman Gene Green, who attended the signing, says the goal of the bill is to "empower the individual." But he adds it's a "work in progress," and Congress may need to revisit the issue.