Add email validators

library/Respect/Validation/Exceptions/EmailException.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Respect\Validation\Exceptions;
+
+class EmailException extends ValidationException
+{
+
+    public static $defaultTemplates = array(
+        self::MODE_DEFAULT => array(
+            self::STANDARD => '{{name}} must be valid email',
+        ),
+        self::MODE_NEGATIVE => array(
+            self::STANDARD => '{{name}} must not be email',
+        )
+    );
+
+}

library/Respect/Validation/Rules/Email.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Respect\Validation\Rules;
+
+class Email extends AbstractRule
+{
+
+    public function validate($input)
+    {
+       if (!is_string($input)) {
+           return false;
+       }
+
+        return filter_var($input, FILTER_VALIDATE_EMAIL);
+    }
+}