Y-mail is simply another name for Yahoo! Mail, the email service offered by Yahoo. It was launched in 1997.
In essence, using "y-mail" is the same as saying "Yahoo! Mail". Think of it as a shortened, colloquial way of referring to the service. While Yahoo! Mail once held a prominent position in the email market, it has since been surpassed by Gmail. For example, in 2024, Yahoo! Mail (y-mail) has around 200 million users compared to Gmail's nearly 2 billion.
Therefore, when someone mentions "y-mail," they are referring to the email service provided by Yahoo!.
