MUNDELEIN, Illinois (Reuters) - Santa Claus can't get his mail. Postal officials in this Chicago suburb said that a man with the legal name Santa Claus may not receive the mountain of holiday mail addressed to the jolly symbol of Christmas without the proper address -- and it's not the North Pole. A construction company owner named Robert Rion, who recently changed his name to Santa Claus, has been told he is not entitled to the daily flood of 300 letters that arrive at Mundelein's post office addressed: Santa Claus, North Pole. "It would be like someone named John Smith wanting all the mail addressed to all the John Smiths. That's why we have legal addresses," postal service spokesman Tim Ratliff said. For one thing, there are numerous charitable groups who want to answer the thousands of letters addressed to Santa every year, many of them requests for gifts, Mundelein postmaster Mary Cardwell said. Mundelein's Santa Claus has been told to get a post office box or publicize his private address. In any case, "we haven't received a single piece of mail (for the Mundelein Santa)," Cardwell said. A call to Claus's listed telephone number was answered by a message machine saying he was out either feeding his reindeer, checking on whether children were being good, or taking a nap.