If your mail server requires authentication or if you just need to communicate directly via sockets, refer to the documentation on fsockopen(). Armed with telnet and some RFCs you can work out exactly what you need to do for the target server in question.
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Manual Page -- [url]http://www.php.net/manual/en/function.mail.php[/url]
Edit Note -- [url]http://master.php.net/manage/user-notes.php?action=edit+33991[/url]
Delete Note -- [url]http://master.php.net/manage/user-notes.php?action=delete+33991&report=yes[/url]
Reject Note -- [url]http://master.php.net/manage/user-notes.php?action=reject+33991&report=yes[/url]