Check whether email address is temporary (disposable) using MX check (best option)

checkDisposableEmail.php

<?php

/**
* This function checks whether the email address
* is a temporary email address
* @param string $email The email address to check
* @return boolean
*/
function isTemporaryAddress(String $email):bool {
	// TODO: that should maybe stored elsewhere
	$blacklist = [
		'yopmail.com',
		'87.98.164.155',
		'yopmail.fr',
		'yopmail.net',
		'jetable.fr.nf',
		'nospam.ze.tc',
		'nomail.xl.cx',
		'mega.zik.dj',
		'speed.1s.fr',
		'cool.fr.nf',
		'courriel.fr.nf',
		'moncourrier.fr.nf',
		'monemail.fr.nf',
		'monmail.fr.nf',
		'tempomail.fr',
		// TODO: this list needs to be completed
	];

	// Getting the email's hostname
	$domain = substr(strrchr($email, '@'), 1);

	// If the MX lookup went fine
	if (getmxrr($domain, $mxs)) {
		// Trying to find a banned hostname among all MX servers
		$filter = array_filter($mxs, function($m) use ($blacklist) {
			// Comparing each MX hostname Vs the blacklist
			foreach ($blacklist as $b) {
				// This hostname is banned
				if (strpos($m, $b) !== false) {
					return $m;
				}
			}
		});

		// We found at least one banned hostname
		if (! empty($filter) && is_array($filter) && count($filter) > 0) {
			return true;
		}
	}

	// Assuming everything went fine
	return false;
}

// Email address to check
$email = 'test@jetable.fr.nf';
var_dump(isTemporaryAddress($email));