CVE-2002-0986

The mail function in PHP 4.x to 4.2.2 does not filter ASCII control characters from its arguments, which could allow remote attackers to modify mail message content, including mail headers, and possibly use PHP as a "spam proxy."...

PHP Mail Function Header Spoofing

The remote host is running a version of PHP prior or equal to 4.2.2. The mail function does not properly sanitize user input. This allows users to forge email to make it look like it is coming from a different source other than the server. Users can exploit this even if SAFEMODE is enabled...