Ymail is an email service offered by Yahoo, which is an alternative domain that users can choose upon signing up for the email service. It was launched in 2008 as an alternative to Yahoo! Mail. Ymail offers many of the same features as Yahoo! Mail, and both use the same interface. There is no difference between the various email suffixes, it is just a question of preference. Ymail is a perfectly valid email service that millions of people still use for sending and receiving email messages. Yahoo wanted to give email users more email address options to pick from, so they added the Ymail domain to the list of available suffixes. Whichever suffix their user picked, they had the same mail interface, features, and storage size available to them.