Yahoo! Mail - Spam Policy

Spam Policy

Like most free Webmail providers, Yahoo! Mail is often used by spammers to provide a "remove me" email address. More often than not, these addresses are used for the express purpose of verifying the recipient's address—thus opening the door for more spam. However, Yahoo! does not tolerate this practice. It terminates accounts connected with spam-related activities without warning, and spammers lose access to any other Yahoo! services connected with their ID under the Terms of Service.

In February 2006, Yahoo! also announced its decision (along with AOL) to give some organizations the option to "certify" mail, by paying up to one cent for each outgoing message, allowing the mail in question to bypass Yahoo!'s and AOL's inbound spam filters.

In April 2011, Yahoo! Mail began rejecting spam reports that involve sending a copy of the spam with full headers to Yahoo!'s abuse department via the email address abuse (at) yahoo.com, and the response email for those that did was to use 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 MX record. Yahoo!'s claim was that its "standard" was "better" than the Internet standards referred to.