/**
* Send email through socket
*
* This static method sends an email through a simple socket connection.
* If {@link $smtp_relay} is set, it will be used as a relay to send the
* email. Instead, email is sent directly to MX host of domain.
*
* @param string $to Email destination
* @param string $subject Email subject
* @param string $message Email message
* @param string|array $headers Email headers
* @throws Exception
*/
public static function mail($to, $subject, $message, $headers = null)
{
$from = self::getFrom($headers);
$H = 'Return-Path: <' . $from . ">\r\n";
$from_host = explode('@', $from);
$from_host = $from_host[1];
$to_host = explode('@', $to);
$to_host = $to_host[1];
if (self::$smtp_relay != null) {
$mx = array(gethostbyname(self::$smtp_relay) => 1);
} else {
$mx = mail::getMX($to_host);
}
foreach ($mx as $h => $w) {
self::$fp = @fsockopen($h, 25, $errno, $errstr, self::$timeout);
if (self::$fp !== false) {
break;
}
}
if (!is_resource(self::$fp)) {
self::$fp = null;
throw new Exception('Unable to open socket');
}
# We need to read the first line
fgets(self::$fp);
$data = '';
# HELO cmd
if (!self::cmd('HELO ' . $from_host, $data)) {
self::quit();
throw new Exception($data);
}
# MAIL FROM: <...>
if (!self::cmd('MAIL FROM: <' . $from . '>', $data)) {
self::quit();
throw new Exception($data);
}
# RCPT TO: <...>
if (!self::cmd('RCPT TO: <' . $to . '>', $data)) {
self::quit();
throw new Exception($data);
}
# Compose mail and send it with DATA
$H = 'Return-Path: <' . $from . ">\r\n";
$H .= 'To: <' . $to . ">\r\n";
$H .= 'Subject: ' . $subject . "\r\n";
$H .= $headers . "\r\n";
$message = $H . "\r\n\r\n" . $message;
if (!self::sendMessage($message, $data)) {
self::quit();
throw new Exception($data);
}
self::quit();
}
