PHP script to monitor exim mail queue

When you run exim mail server, it is good to keep an eye on number of emails in mail queue. here is a PHP script that will check number of emails in queue, if it exceed pre-set number, it will email you.

Create file

mkdir /usr/serverok/
vi /usr/serverok/mail_q_monitor.php

Add following content.

 $alertOn) {
    $hostname = exec('/bin/hostname');
    $subject = 'Mail queue alert on ' . $hostname;
    $mail_text = 'Mail queue on server ' . $hostname . ' have ' . $num_mails . ' mails';
    mail($adminEmail, $subject, $mail_text);
}

In this case, if mails in queue exceeded 100, you get email.

$alertOn = 100;

You can change 100 to whatever number you need.

$adminEmail = "[email protected]";

Replace [email protected] with your email address.

Set script to run every 10 minutes using cronjob

*/10 * * * * /usr/local/bin/php /usr/serverok/mail_q_monitor.php >/dev/null 2>&1