How can one check if their mail server's IP address is on a blacklist and resolve the issue?

To check if your mail server's IP address is on a blacklist, you can use online tools like MXToolbox or Spamhaus. If your IP address is listed, you can request removal by following the instructions provided by the blacklist provider. This typically involves proving that your server is not sending spam or malicious emails. 

// Example PHP code to check if mail server IP is blacklisted using MXToolbox API

$ip_address = '123.456.789.0';
$api_url = 'https://mxtoolbox.com/SuperTool.aspx?action=blacklist%3a' . $ip_address . '&run=toolpage';

$response = file_get_contents($api_url);

if (strpos($response, 'blacklisted') !== false) {
    echo 'Mail server IP address is blacklisted.';
} else {
    echo 'Mail server IP address is not blacklisted.';
}

Keywords

mail server IP address blacklist resolve PHP

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