How to check, by PHP, if my script is connecting to SMTP server

Question

Simply what the title says. Want to know how to check if the connection is working and if not, what is the error. Btw the SMTP server is exchange 2007.

Answer 1

it could be due to your SMTP port is not allowed on firewall so Try this php script to check open ports, it's have maximum popular port checking:

'interspire.smtp.com','number'=>25);
$ports[] = array('host'=>'interspire.smtp.com','number'=>2525);
$ports[] = array('host'=>'interspire.smtp.com','number'=>25025);
$ports[] = array('host'=>'helpme.interspire.smtp.com','number'=>80);

$ports[] = array('host'=>'google.com','number'=>80);
$ports[] = array('host'=>'smtp.gmail.com','number'=>587);
$ports[] = array('host'=>'smtp.gmail.com','number'=>465);
$ports[] = array('host'=>'pop.gmail.com','number'=>995);
$ports[] = array('host'=>'imap.gmail.com','number'=>993);

$ports[] = array('host'=>'ftp.mozilla.org','number'=>21);
$ports[] = array('host'=>'smtp2go.com','number'=>8025);

$ports[] = array('host'=>'relay.dnsexit.com','number'=>25);
$ports[] = array('host'=>'relay.dnsexit.com','number'=>26);
$ports[] = array('host'=>'relay.dnsexit.com','number'=>940);
$ports[] = array('host'=>'relay.dnsexit.com','number'=>8001);
$ports[] = array('host'=>'relay.dnsexit.com','number'=>2525);
$ports[] = array('host'=>'relay.dnsexit.com','number'=>80);

$ports[] = array('host'=>'mail.authsmtp.com','number'=>23);
$ports[] = array('host'=>'mail.authsmtp.com','number'=>25);
$ports[] = array('host'=>'mail.authsmtp.com','number'=>26);
$ports[] = array('host'=>'mail.authsmtp.com','number'=>2525);

foreach ($ports as $port)
{
    //$connection = @fsockopen($port['host'], $port['number']);
    $connection = @fsockopen($port['host'], $port['number'], $errno, $errstr, 5); // 5 second timeout for each port.

    if (is_resource($connection))
    {
        echo '
' . $port['host'] . ':' . $port['number'] . ' ' . '(' . getservbyport($port, 'tcp') . ') is open.
' . "\n";

        fclose($connection);
    }

    else
    {
        echo '
' . $port['host'] . ':' . $port['number'] . ' is not responding.
' . "\n";
    }
}


?>

Source From: https://www.interspire.com/support/kb/getattachment.php?data=MTA2OHxwb3J0Y2hlY2sucGhw