History of Yahoo!
On March 8, 1997, Yahoo! acquired online communications company Four11. Four11's webmail service, Rocketmail, became Yahoo! Mail. Yahoo! also acquired ClassicGames.com and turned it into Yahoo! Games. Yahoo! then acquired direct marketing company Yoyodyne Entertainment, Inc. on October 12, 1998. In January 1999, Yahoo! acquired web hosting provider GeoCities. Another company Yahoo! took over was eGroups, which became Yahoo! Groups in June 2000. On March 8, 1998, Yahoo! launched Yahoo! Pager, an instant messaging service that was renamed Yahoo! Messenger a year later.
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.