how to check smtp server is working or not using php

Question

i want to check whether my websites smtp is down or up using php . I tried to connect to port 25 on my server using fsockopen, then it returns true when there is smtp service running. Which is the best method to test whether smtp or ftp running using php script.

Solution

you are talking of a smtp server , so you must have the pear framework enabled. I had a link http://www.authsmtp.com/php-pear-mail/ which can be of help. or you can do this:

$f = fsockopen('smtp host', 25) ;
if ($f !== false) {
    $res = fread($f, 1024) ;
    if (strlen($res) > 0 && strpos($res, '220') === 0) {
        echo "Success!" ;
    }
    else {
        echo "Error: " . $res ;
    }
}
fclose($f) ;