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diff --git a/web/core/modules/user/src/Plugin/Validation/Constraint/UserMailRequired.php b/web/core/modules/user/src/Plugin/Validation/Constraint/UserMailRequired.php
new file mode 100644
index 000000000..b500a8d97
--- /dev/null
+++ b/web/core/modules/user/src/Plugin/Validation/Constraint/UserMailRequired.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Drupal\user\Plugin\Validation\Constraint;
+
+use Symfony\Component\Validator\Constraint;
+
+/**
+ * Checks if the user's email address is provided if required.
+ *
+ * The user mail field is NOT required if account originally had no mail set
+ * and the user performing the edit has 'administer users' permission.
+ * This allows users without email address to be edited and deleted.
+ *
+ * @Constraint(
+ *   id = "UserMailRequired",
+ *   label = @Translation("User email required", context = "Validation")
+ * )
+ */
+class UserMailRequired extends Constraint {
+
+  /**
+   * Violation message. Use the same message as FormValidator.
+   *
+   * Note that the name argument is not sanitized so that translators only have
+   * one string to translate. The name is sanitized in self::validate().
+   *
+   * @var string
+   */
+  public $message = '@name field is required.';
+
+}