<?php
$user = 'root';
$pass = 'PASSWORD';

$host = 'SERVER_IP or HOSTNAME';
$domain = 'DOMAIN'; 

$url = 'https://'.rawurlencode($user).':'.rawurlencode($pass).'@'.$host.':2005/index.php?api=json&act=mxentry&domain='.$domain;

// Set the curl parameters 
$ch = curl_init(); 
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 

if(!empty($post)){
	curl_setopt($ch, CURLOPT_POST, 1);
	curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post));
}
// Get response from the server. 
$resp = curl_exec($ch);
// print_r($resp);

// The response will hold a string as per the API response method. In this case its PHP Serialize
$res = json_decode($resp, true);

print_r($res);