Enable email sender to publish an event if smtp is not configured (#10352)

src/Umbraco.Core/Notifications/SendEmailNotification.cs

@@ -0,0 +1,11 @@
+using Umbraco.Cms.Core.Models;
+
+namespace Umbraco.Cms.Core.Notifications
+{
+    public class SendEmailNotification : INotification
+    {
+        public SendEmailNotification(EmailMessage message) => Message = message;
+
+        public EmailMessage Message { get; set; }
+    }
+}