Updated

Fan mail — that old barometer of an entertainer's popularity — has become off-limits for many in Hollywood since the anthrax mail attacks in New York City, Washington and Florida.

Studios, networks and publicists say thousands of letters have been returned to sender or just set aside. Some celebrities have signed up with services that open fan-mail for them; others have simply stopped opening mail.

``For the time being, we are just not opening fan mail. Just to be careful, we are putting it off for now,'' said publicist Pat Kingsley, who represents actor Tom Cruise, among others.