diff --git a/platform/php/MailChecker.php b/platform/php/MailChecker.php
index fb5a1e33..059e6f85 100644
--- a/platform/php/MailChecker.php
+++ b/platform/php/MailChecker.php
@@ -41,7 +41,13 @@ public static function isBlacklisted(string $email): bool
         $parts = explode('@', $email);
         $domain = end($parts);
 
-        foreach (self::allDomainSuffixes($domain) as $domainSuffix) {
+        return self::isDomainBlocked($domain, true);
+    }
+
+    public static function isDomainBlocked(string $domain, bool $checkSubdomain): bool
+    {
+        $domainSuffixes = $checkSubdomain ? self::allDomainSuffixes($domain) : [$domain];
+        foreach ($domainSuffixes as $domainSuffix) {
             if (isset(self::$blocklist[$domainSuffix])) {
                 return true;
             }
diff --git a/test/platform.php.test.php b/test/platform.php.test.php
index 512bdf0f..5c6f9f6f 100644
--- a/test/platform.php.test.php
+++ b/test/platform.php.test.php
@@ -64,8 +64,9 @@ public function testReturnFalseIfThrowableDomain()
 
     public static function provideBlackListTests()
     {
-        foreach (array_rand(MailChecker::blacklist(), 1000) as $blacklistedDomain) {
-            yield [$blacklistedDomain];
+        $blacklist = MailChecker::blacklist();
+        foreach (array_rand($blacklist, 1000) as $key) {
+            yield [$blacklist[$key]];
         }
     }
 
@@ -90,4 +91,13 @@ public function testAddCustomDomains()
         $this->isInvalid('foo@google.com');
         $this->isValid('ok@gmail.com');
     }
+
+    #[DataProvider('provideBlackListTests')]
+    public function testIsDomainBlocked($blacklistedDomain)
+    {
+        $this->assertEquals(true, MailChecker::isDomainBlocked($blacklistedDomain, true));
+        $this->assertEquals(true, MailChecker::isDomainBlocked('subdomain.'.$blacklistedDomain, true));
+        $this->assertEquals(true, MailChecker::isDomainBlocked($blacklistedDomain, false));
+        $this->assertEquals(false, MailChecker::isDomainBlocked('subdomain.'.$blacklistedDomain, false));
+    }
 }