Yahoo!
Yahoo grew rapidly throughout the 1990s. Yahoo went public in April 1996 and its stock price rose by 600 percent within two years. Like many search engines and web directories, Yahoo added a web portal, putting it in competition with services like Excite, Lycos and America Online. By 1998, Yahoo was the most popular starting point for web users, and the human-edited Yahoo Directory the most popular search engine, receiving 95 million page views per day which was triple the number compared to rival Excite. It also made many high-profile acquisitions. Yahoo began offering free e-mail from October 1997 after the acquisition of RocketMail, which was then renamed to Yahoo! Mail. In 1998, Yahoo! decided to replace AltaVista as the crawler-based search engine underlying the Directory with Inktomi. Yahoo's two biggest acquisitions were made in 1999 - that of Geocities for $3.6 billion, and Broadcast.com for $5.7 billion.
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.