diff --git a/backend/src/Squidex.Domain.Apps.Core.Operations/HandleRules/Result.cs b/backend/src/Squidex.Domain.Apps.Core.Operations/HandleRules/Result.cs
index d90a41ac4..160259a99 100644
--- a/backend/src/Squidex.Domain.Apps.Core.Operations/HandleRules/Result.cs
+++ b/backend/src/Squidex.Domain.Apps.Core.Operations/HandleRules/Result.cs
@@ -33,6 +33,13 @@ namespace Squidex.Domain.Apps.Core.HandleRules
                 dumpBuilder.AppendLine("Action timed out.");
             }
 
+            if (Exception != null)
+            {
+                dumpBuilder.AppendLine();
+                dumpBuilder.Append("Error: ");
+                dumpBuilder.AppendLine(Exception.Message);
+            }
+
             dumpBuilder.AppendLine();
             dumpBuilder.AppendFormat("Elapsed {0}.", elapsed);
             dumpBuilder.AppendLine();
diff --git a/backend/src/Squidex.Domain.Apps.Entities/History/NotifoService.cs b/backend/src/Squidex.Domain.Apps.Entities/History/NotifoService.cs
index 7a6e7e248..2a97562d5 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/History/NotifoService.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/History/NotifoService.cs
@@ -99,7 +99,6 @@ namespace Squidex.Domain.Apps.Entities.History
             var userRequest = new UpsertUserRequest
             {
                 AppId = options.AppId,
-                EmailAddress = user.Email,
                 FullName = user.DisplayName(),
                 PreferredLanguage = "en",
                 PreferredTimezone = null,
@@ -108,6 +107,11 @@ namespace Squidex.Domain.Apps.Entities.History
                 UserId = user.Id
             };
 
+            if (user.Email.IsEmail())
+            {
+                userRequest.EmailAddress = user.Email;
+            }
+
             var response = await client.UpsertUserAsync(userRequest);
 
             await userResolver.SetClaimAsync(user.Id, SquidexClaimTypes.NotifoKey, response.User.ApiKey);