US Postal Service mailboxes are seen awaiting disposal Thursday, Sept. 1, in San Jose, Calif. Because of steeply declining use, the U.S. Postal Service has removed more than 60 percent of the blue boxes, the chief culprit is the Internet. More people are paying bills, sending invitations and writing personal letters online. The volume of mail dropped into mailboxes has dropped 35 percent since 2006, said Sue Brennan, a U.S. Postal Service spokeswoman.