$this->header .= "MIME-Version: 1.0\n";
$this->header .= "Content-Type: multipart/mixed;\n boundary=\"$this->boundary\"\n";
$this->header .= "This is a multi-part message in MIME format.\n";
$this->header .= "MIME-Version: 1.0\n";
$this->header .= "Content-Type: multipart/mixed;\n boundary=\"$this->boundary\"\n";
$this->header .= "This is a multi-part message in MIME format.\n";