Health insurer Aetna, Inc., will offer free credit monitoring for a year to about 65,000 people after some e-mails were copied from the health insurer's job application Web site. The company said Social Security numbers of current and former employees and people who received job offers from the company were stored on the Web site, which was maintained by an outside vendor. Most of the information was from current and former employees. For people who received job offers, the site also stored phone numbers, addresses, and employment histories.