Update E-mail validation so that it uses hostname validation.

Author: serge-kvashnin

src/Validation/EmailValidation.php

@@ -6,6 +6,7 @@
 
 use Norvica\Validation\Rule\Email;
 use Norvica\Validation\Exception\ValueRuleViolation;
+use Norvica\Validation\Rule\Hostname;
 
 final class EmailValidation
 {
@@ -23,6 +24,8 @@ public function __invoke(string $value, Email $rule): void
             throw new ValueRuleViolation($message);
         }
 
+        (new HostnameValidation())($domain, new Hostname());
+
         // DNS check (A/MX records)
         if ($rule->dns && !checkdnsrr($domain) && !checkdnsrr($domain, 'A')) {
             throw new ValueRuleViolation($message);

tests/Single/EmailTest.php

@@ -41,6 +41,7 @@ public function testValidDns(string $value): void
 
     public static function invalid(): Generator
     {
+        yield 'invalid domain' => ['a@b.c'];
         yield 'only local part' => ['john.doe'];
         yield 'no domain part' => ['john.doe@'];
         yield 'no local part' => ['@example.com'];