The Spamhaus Project has told a U.S. court that it plans to appeal a recent ruling that threatened the volunteer organization with millions of dollars in legal fines and a possible shutdown of database of known spammers.

The notice was filed Friday in the U.S. District Court for the Northern District of Illinois by lawyers with Jenner & Block LLP, a Chicago law firm that is now representing Spamhaus.

Spamhaus, based in the U.K., has a team of 25 investigators and claims to block between 8 billion and 10 billion e-mail messages per day. Its database is used by several major security vendors, including Microsoft.

The filing marks the group's return to a legal fight against an e-mail marketing company called e360 Insight that Spamhaus had tried its best to ignore.

Spamhaus had not shown up in court to dispute the charges against it, and the organization has made it clear that it does not accept U.S. jurisdiction over its activities. However, this position was apparently reconsidered after a proposed court order was published earlier this month calling on the Internet Corporation for Assigned Names and Numbers (ICANN) and Spamhaus's registrar, Tucows, to pull the project's domain name.

"Spamhaus is... concerned at how far a U.S. court will go before asking itself if it has jurisdiction, and is intending to contest the ruling in order to stamp out further attempts by spammers to abuse the U.S. court system in this way," the organization said in a statement on its Web site. That statement can be found here.

The order, written by the plaintiffs in the case, does not have the force of law, but if the judge decides to accept it, observers said that it could kick off a power struggle between ICANN, which is responsible for the Internet's domain name system, and the U.S. courts.

Spamhaus's new legal counsel, Jenner & Block, is a well-respected firm with over 400 lawyers.

It has offered its services in the case for free, said John Reid, a Spamhaus volunteer. "We are a nonprofit organization; spammers know this. That's why they sue, hoping we cannot afford to defend ourselves," Reid said. "Luckily, since we're the good guys, there are a lot of great lawyers, law firms, and law professors around the world willing to step up and help."

The IDG News Service is a Network World affiliate.