diff --git a/core/modules/contact/config/schema/contact.schema.yml b/core/modules/contact/config/schema/contact.schema.yml
index e8df71a..4a85fc0 100644
--- a/core/modules/contact/config/schema/contact.schema.yml
+++ b/core/modules/contact/config/schema/contact.schema.yml
@@ -43,6 +43,9 @@ contact.settings:
     user_default_enabled:
       type: boolean
       label: 'Personal contact form enabled by default'
+    contact_default_scope:
+      type: integer
+      label: 'Personal contact form enabled by default for existing users'
 
 migrate.source.d6_contact_settings:
   type: migrate_source_sql
diff --git a/core/modules/contact/src/Tests/ContactPersonalTest.php b/core/modules/contact/src/Tests/ContactPersonalTest.php
index 031ee75..8426b4a 100644
--- a/core/modules/contact/src/Tests/ContactPersonalTest.php
+++ b/core/modules/contact/src/Tests/ContactPersonalTest.php
@@ -221,6 +221,16 @@ function testPersonalContactAccess() {
 
     $this->drupalGet('user/' . $this->contactUser->id() . '/contact');
     $this->assertResponse(200);
+
+    // Test "Enable by default" for existing users.
+    $this->moduleInstaller()->uninstall(['contact']);
+    $this->contactUserPreEnable = $this->drupalCreateUser();
+    $this->moduleInstaller()->install(['contact']);
+    $edit = ['contact_default_status' => FALSE, 'contact_default_scope' => 1];
+    $this->drupalPostForm('admin/config/people/accounts', $edit, t('Save configuration'));
+    $this->drupalGet('user/' . $this->contactUserPreEnable->id() . '/contact');
+    $this->assertResponse(200);
+
   }
 
   /**