PhotoMail works by placing small thumbnail pictures in messages and storing the actual large photo files on a server of the Yahoo Photo online album service, says Andy Spillane, vice president of Yahoo Mail. Up to 300 thumbnails can be inserted in a Yahoo Mail message. When recipients click on a thumbnail, the original file residing on a Yahoo server is launched, so that a high-resolution version of the photo can be viewed, printed, or saved, Spillane says.
Currently, PhotoMail is only available to a small number of Yahoo mail users, but it is possible to sign up to help test it. Soon, it should be available to all users as a standard part of the company's e-mail service.