Yahoo! Mail
Yahoo! Mail is an email service launched in 1997 through the American parent company Yahoo!. Yahoo Mail provides four different email plans: three for personal use (Basic, Plus, and Ad Free) and another for businesses. By December 2011, Yahoo! Mail had 281 million users, making it the third largest web-based email service in the world. Since 2015 its webmail client also supports managing non-Yahoo e-mail accounts.
Yahoo! Mail
In April 2011, Yahoo! Mail began rejecting spam reports, which involved sending a copy of the spam with full headers by email to Yahoo's abuse department, offering the use of a form instead. However, the requirement to use a form is prohibited by several Internet RFCs, and the availability of abuse at example.com (in this case abuse at yahoo.com) is required by the Invariants clause of RFC 2142, because the domain has a mail server and an MX record. Yahoo's claim was that its "standard" was better than the Internet standards referred to. This is the only working form through which users can report spam or misuse of the Yahoo! email service.