diff --git a/scripts/provision-10-enable-dev-modules.sh b/scripts/provision-10-enable-dev-modules.sh
index 40d3e4db..b94512a5 100755
--- a/scripts/provision-10-enable-dev-modules.sh
+++ b/scripts/provision-10-enable-dev-modules.sh
@@ -53,6 +53,10 @@ task "Installing Testmode module."
 drush pm:install testmode
 pass "Installed Testmode module."
 
+task "Installing Reroute Email module."
+drush pm:install reroute_email
+pass "Installed Reroute Email module."
+
 task "Installing Generated content module."
 if [ "${DRUPAL_GENERATED_CONTENT_SKIP}" = "1" ]; then
   note "Content generation skipped. DRUPAL_GENERATED_CONTENT_SKIP is set to 1."
diff --git a/tests/phpunit/Drupal/EnvironmentSettingsTest.php b/tests/phpunit/Drupal/EnvironmentSettingsTest.php
index d241ee8a..53acf9da 100644
--- a/tests/phpunit/Drupal/EnvironmentSettingsTest.php
+++ b/tests/phpunit/Drupal/EnvironmentSettingsTest.php
@@ -266,7 +266,7 @@ public function testEnvironmentNoOverrides(): void {
     $this->assertConfig($config);
 
     $settings['auto_create_htaccess'] = FALSE;
-    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'sdc_devel', 'testmode'];
+    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'reroute_email', 'sdc_devel', 'testmode'];
     $settings['container_yamls'][0] = $this->app_root . '/' . $this->site_path . '/services.yml';
     $settings['entity_update_batch_size'] = 50;
     $settings['environment'] = self::ENVIRONMENT_SUT;
@@ -345,7 +345,7 @@ public function testEnvironmentOverrides(): void {
 
     // Verify settings overrides.
     $settings['auto_create_htaccess'] = FALSE;
-    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'sdc_devel', 'testmode'];
+    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'reroute_email', 'sdc_devel', 'testmode'];
     $settings['config_sync_directory'] = 'custom_config';
     $settings['container_yamls'][0] = $this->app_root . '/' . $this->site_path . '/services.yml';
     $settings['entity_update_batch_size'] = 50;
@@ -432,7 +432,7 @@ public function testEnvironmentLocal(): void {
     $this->assertConfig($config);
 
     $settings['auto_create_htaccess'] = FALSE;
-    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'sdc_devel', 'testmode'];
+    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'reroute_email', 'sdc_devel', 'testmode'];
     $settings['container_yamls'][0] = $this->app_root . '/' . $this->site_path . '/services.yml';
     $settings['disable_captcha'] = TRUE;
     $settings['entity_update_batch_size'] = 50;
@@ -490,7 +490,7 @@ public function testEnvironmentLocalContainer(): void {
     $this->assertConfig($config);
 
     $settings['auto_create_htaccess'] = FALSE;
-    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'sdc_devel', 'testmode'];
+    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'reroute_email', 'sdc_devel', 'testmode'];
     $settings['container_yamls'][0] = $this->app_root . '/' . $this->site_path . '/services.yml';
     $settings['disable_captcha'] = TRUE;
     $settings['entity_update_batch_size'] = 50;
@@ -571,7 +571,7 @@ public function testEnvironmentGha(): void {
     $this->assertConfig($config);
 
     $settings['auto_create_htaccess'] = FALSE;
-    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'sdc_devel', 'testmode'];
+    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'reroute_email', 'sdc_devel', 'testmode'];
     $settings['container_yamls'][0] = $this->app_root . '/' . $this->site_path . '/services.yml';
     $settings['disable_captcha'] = TRUE;
     $settings['entity_update_batch_size'] = 50;
@@ -647,7 +647,7 @@ public function testEnvironmentLagoonPreview(): void {
 
     $settings['auto_create_htaccess'] = FALSE;
     $settings['cache_prefix']['default'] = 'test_project_test_branch';
-    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'sdc_devel', 'testmode'];
+    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'reroute_email', 'sdc_devel', 'testmode'];
     $settings['config_sync_directory'] = '../config/default';
     $settings['container_yamls'][0] = $this->app_root . '/' . $this->site_path . '/services.yml';
     $settings['entity_update_batch_size'] = 50;
@@ -707,7 +707,7 @@ public function testEnvironmentLagoonDev(): void {
 
     $settings['auto_create_htaccess'] = FALSE;
     $settings['cache_prefix']['default'] = 'test_project_develop';
-    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'sdc_devel', 'testmode'];
+    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'reroute_email', 'sdc_devel', 'testmode'];
     $settings['config_sync_directory'] = '../config/default';
     $settings['container_yamls'][0] = $this->app_root . '/' . $this->site_path . '/services.yml';
     $settings['entity_update_batch_size'] = 50;
@@ -760,14 +760,14 @@ public function testEnvironmentLagoonTest(): void {
     $config['shield.settings']['shield_enable'] = TRUE;
     $config['system.performance']['cache']['page']['max_age'] = 900;
     $config['testmode.settings']['views_node'] = ['content', 'civictheme_automated_list'];
-    $config['reroute_email.settings']['enable'] = FALSE;
+    $config['reroute_email.settings']['enable'] = TRUE;
     $config['reroute_email.settings']['address'] = 'webmaster@drevops.com';
     $config['reroute_email.settings']['allowed'] = '*@drevops.com';
     $this->assertConfig($config);
 
     $settings['auto_create_htaccess'] = FALSE;
     $settings['cache_prefix']['default'] = 'test_project_master';
-    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'sdc_devel', 'testmode'];
+    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'reroute_email', 'sdc_devel', 'testmode'];
     $settings['config_sync_directory'] = '../config/default';
     $settings['container_yamls'][0] = $this->app_root . '/' . $this->site_path . '/services.yml';
     $settings['entity_update_batch_size'] = 50;
@@ -827,7 +827,7 @@ public function testEnvironmentLagoonProd(): void {
 
     $settings['auto_create_htaccess'] = FALSE;
     $settings['cache_prefix']['default'] = 'test_project_production';
-    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'sdc_devel', 'testmode'];
+    $settings['config_exclude_modules'] = ['devel', 'do_generated_content', 'generated_content', 'purge_control', 'reroute_email', 'sdc_devel', 'testmode'];
     $settings['config_sync_directory'] = '../config/default';
     $settings['container_yamls'][0] = $this->app_root . '/' . $this->site_path . '/services.yml';
     $settings['entity_update_batch_size'] = 50;
diff --git a/tests/phpunit/Drupal/SwitchableSettingsTest.php b/tests/phpunit/Drupal/SwitchableSettingsTest.php
index b628adac..ef071697 100644
--- a/tests/phpunit/Drupal/SwitchableSettingsTest.php
+++ b/tests/phpunit/Drupal/SwitchableSettingsTest.php
@@ -717,12 +717,12 @@ public static function dataProviderRerouteEmail(): \Iterator {
       ],
     ];
 
-    // Stage: disabled by default.
+    // Stage: enabled by default.
     yield [
       self::ENVIRONMENT_STAGE,
       [],
       [
-        'reroute_email.settings' => ['enable' => FALSE, 'address' => 'webmaster@drevops.com', 'allowed' => '*@drevops.com'],
+        'reroute_email.settings' => ['enable' => TRUE, 'address' => 'webmaster@drevops.com', 'allowed' => '*@drevops.com'],
       ],
     ];
 
@@ -757,6 +757,17 @@ public static function dataProviderRerouteEmail(): \Iterator {
       ],
     ];
 
+    // Stage with DRUPAL_REROUTE_EMAIL_DISABLED: forced off.
+    yield [
+      self::ENVIRONMENT_STAGE,
+      [
+        'DRUPAL_REROUTE_EMAIL_DISABLED' => 1,
+      ],
+      [
+        'reroute_email.settings' => ['enable' => FALSE],
+      ],
+    ];
+
     // Custom address and allowed list.
     yield [
       self::ENVIRONMENT_DEV,
@@ -980,7 +991,7 @@ public static function dataProviderMailCollector(): \Iterator {
       ],
     ];
 
-    // Stage: delivered to the original recipients.
+    // Stage: rerouted, then delivered to the rerouting address.
     yield [
       self::ENVIRONMENT_STAGE,
       [],
diff --git a/web/sites/default/includes/modules/settings.reroute_email.php b/web/sites/default/includes/modules/settings.reroute_email.php
index 1c44d2f5..1822eb1c 100644
--- a/web/sites/default/includes/modules/settings.reroute_email.php
+++ b/web/sites/default/includes/modules/settings.reroute_email.php
@@ -7,18 +7,21 @@
 
 declare(strict_types=1);
 
+$settings['config_exclude_modules'][] = 'reroute_email';
+
 $config['reroute_email.settings']['address'] = getenv('DRUPAL_REROUTE_EMAIL_ADDRESS') ?: 'webmaster@drevops.com';
 $config['reroute_email.settings']['allowed'] = getenv('DRUPAL_REROUTE_EMAIL_ALLOWED') ?: '*@drevops.com';
 
-if (!in_array($settings['environment'], [ENVIRONMENT_LOCAL, ENVIRONMENT_CI, ENVIRONMENT_STAGE, ENVIRONMENT_PROD], TRUE)) {
+if (in_array($settings['environment'], [ENVIRONMENT_LOCAL, ENVIRONMENT_CI, ENVIRONMENT_PROD], TRUE)) {
+  // Deliver every message to its intended recipient. Local and CI capture
+  // outgoing mail by other means, and production sends to real recipients.
+  $config['reroute_email.settings']['enable'] = FALSE;
+}
+else {
   // Send every outgoing message to the address above instead of to its
   // intended recipient, unless that recipient matches the allowed list.
   $config['reroute_email.settings']['enable'] = TRUE;
 }
-else {
-  // Deliver every message to its intended recipient.
-  $config['reroute_email.settings']['enable'] = FALSE;
-}
 
 // Allow an environment to opt out of the rerouting set above.
 if (!empty(getenv('DRUPAL_REROUTE_EMAIL_DISABLED'))) {