Reduced email error messages (#16183)

fixes https://github.com/TryGhost/Team/issues/2487

ghost/admin/app/services/feature.js

@@ -66,6 +66,7 @@ export default class FeatureService extends Service {
     @feature('emailStability') emailStability;
     @feature('webmentions') webmentions;
     @feature('outboundLinkTagging') outboundLinkTagging;
+    @feature('emailErrors') emailErrors;
 
     _user = null;
 

ghost/admin/app/templates/settings/labs.hbs

@@ -239,6 +239,19 @@
                         </div>
                     </div>
                 </div>
+                <div class="gh-expandable-block">
+                    <div class="gh-expandable-header">
+                        <div>
+                            <h4 class="gh-expandable-title">Show email errors</h4>
+                            <p class="gh-expandable-description">
+                                This makes email errors visible in the UI.
+                            </p>
+                        </div>
+                        <div class="for-switch">
+                            <GhFeatureFlag @flag="emailErrors" />
+                        </div>
+                    </div>
+                </div>
             </div>
         </div>
         {{/if}}

ghost/core/core/server/api/endpoints/utils/serializers/output/mappers/emails.js

@@ -1,4 +1,6 @@
 const mega = require('../../../../../../services/mega');
+const labs = require('../../../../../../../shared/labs');
+const config = require('../../../../../../../shared/config');
 
 module.exports = (model, frame) => {
     const jsonModel = model.toJSON ? model.toJSON(frame.options) : model;
@@ -13,5 +15,11 @@ module.exports = (model, frame) => {
         );
     });
 
+    if (!labs.isSet('emailErrors') && !!(config.get('bulkEmail') && config.get('bulkEmail').mailgun)) {
+        if (jsonModel.status === 'failed') {
+            jsonModel.status = 'submitted';
+        }
+    }
+
     return jsonModel;
 };

ghost/core/core/shared/labs.js

@@ -26,7 +26,8 @@ const GA_FEATURES = [
 // NOTE: this allowlist is meant to be used to filter out any unexpected
 //       input for the "labs" setting value
 const BETA_FEATURES = [
-    'activitypub'
+    'activitypub',
+    'emailErrors'
 ];
 
 const ALPHA_FEATURES = [