попробуй через сокеты
function send($server, $to, $from, $subject="", $headers="") {
$headers="To: $to\\nFrom: $from\\nSubject: $subject\\nX-Mailer: The Mouse!\\n$headers";
$fp = fsockopen($server, 25, &$errno, &$errstr, 30);
if (!$fp)
die("Server $server. Connection failed: $errno, $errstr");
fputs($fp,"HELO $server\\n");
fputs($fp,"MAIL FROM: $from\\n");
fputs($fp,"RCPT TO: $to\\n");
fputs($fp,"DATA\\n");
fputs($fp,$this->headers);
if (strlen($headers))
fputs($fp,"$headers\\n");
fputs($fp,$this->mime);
fputs($fp,"\\n.\\nQUIT\\n");
while(!feof($fp))
$resp.=fgets($fp,1024);
fclose($fp);
}