require_once '/Mbox.php';
mixed Mail_Mbox::update (int $message, string $content)
mixed Mail_Mbox::update
Replaces a given message with the text passed to this method.
Note: Mail_Mbox auto adds \n\n at end of the message
Note: messages start with 0.
The number of Message to updated
The new content of the Message
returns Return true if all is ok, else PEAR_Error