Yahoo is expanding its free e-mail service with two new domain names for Yahoo Mail users. The company has added ymail.com and rocketmail.com as options for personalized e-mail addresses. Registration opens Thursday afternoon. With 266 million active accounts, Yahoo bills itself at the world’s largest e-mail service. The company hopes the added domains will give users more selections for simple and memorable addresses that might be already taken on the primary yahoo.com domain.
