How to add Proxy in Mail laravel

Needs to send email using proxy in laravel 8. Cannot able to send email by just using mail. on client server need to add proxy then only mails are getting sent. Example $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_HTTPHEADER, $headers); curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, true); curl_setopt($ch, CURLOPT_PROXY, 'xx.xx.xx.xx:8080');

    curl_setopt($ch, CURLOPT_TIMEOUT, 30);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($mail_data));
    $result = curl_exec($ch);
    $result = curl_error($ch) ? FALSE : $result;
    curl_close($ch);

can someone help