White Buffalo refused to comply, so the university blocked all e-mail from the company. White Buffalo then obtained a temporary restraining order in state court, which school officials appealed in U.S. District Court. After a hearing in May 2003, the court denied the injunction and eventually granted the university's summary judgment motion. That ultimately prompted White Buffalo's, appeal to the Circuit Court.

'I am pleased the [Supreme] Court showed its wisdom in deferring to the sound legal decisions issued by the courts in favor of our client,' Texas Attorney General Greg Abbott, who represented the university, said in a statement. 'The University of Texas ' and indeed every public university ' should always be afforded the right to safeguard its resources by blocking a flood of unwanted e-mail spam.'

White Buffalo officials could not be reached for comment.

This decision is a victory against spammers, said John Mozena, spokesman for the Coalition Against Unsolicited Commercial E-mail. 'It's been a pretty settled concept in law for about a decade that there is not a First Amendment right to spam,' he said. 'This just further solidifies the argument that the anti-spam community has been making successfully for years ' that restrictions on spam are restrictions on the method of speech as opposed to the content of speech and the First Amendment has been found by the courts primarily to protect the content and not the methodology.'