WASHINGTON, DC-- More than a month after moving into the White House, President Bush continues to receive former occupant Bill Clinton's mail, Bush reported Monday. "Is it so hard to fill out a change-of-address form at the post office?" asked Bush, waving a copy of Rolling Stone addressed to Clinton. "I suppose he expects me to mail all this to him. " Bush added that if one more Sierra Club newsletter arrives for Clinton, it is going straight into the trash