diff -u b/core/includes/common.inc b/core/includes/common.inc
--- b/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -286,7 +286,7 @@
  *   TRUE if the address is in a valid format.
  */
 function valid_email_address($mail) {
-  return \Drupal::emailValidator()->isValid($mail);
+  return \Drupal::emailIsValid($mail);
 }
 
 /**
diff -u b/core/lib/Drupal.php b/core/lib/Drupal.php
--- b/core/lib/Drupal.php
+++ b/core/lib/Drupal.php
@@ -648,13 +648,16 @@
   }
 
   /**
-   * Returns the email validator service.
+   * Verifies the syntax of the given email address.
    *
-   * @return \Egulias\EmailValidator\EmailValidator
-   *   The email validator service.
+   * @param string $mail
+   *   A string containing an email address.
+   *
+   * @return bool
+   *   TRUE if the address is in a valid format.
    */
-  public static function emailValidator() {
-    return static::$container->get('email.validator');
+  public static function emailIsValid($mail) {
+    return static::$container->get('email.validator')->isValid($mail);
   }
 
 }