diff --git a/src/Squidex.Domain.Apps.Entities/Apps/Invitation/IInvitationEmailSender.cs b/src/Squidex.Domain.Apps.Entities/Apps/Invitation/IInvitationEmailSender.cs
index 799242fb4..536ac9c07 100644
--- a/src/Squidex.Domain.Apps.Entities/Apps/Invitation/IInvitationEmailSender.cs
+++ b/src/Squidex.Domain.Apps.Entities/Apps/Invitation/IInvitationEmailSender.cs
@@ -12,6 +12,8 @@ namespace Squidex.Domain.Apps.Entities.Apps.Invitation
 {
     public interface IInvitationEmailSender
     {
+        bool IsActive { get; }
+
         Task SendNewUserEmailAsync(IUser assigner, IUser assignee, string appName);
 
         Task SendExistingUserEmailAsync(IUser assigner, IUser assignee, string appName);
diff --git a/src/Squidex.Domain.Apps.Entities/Apps/Invitation/InvitationEmailEventConsumer.cs b/src/Squidex.Domain.Apps.Entities/Apps/Invitation/InvitationEmailEventConsumer.cs
index 58111c21f..01211fcd2 100644
--- a/src/Squidex.Domain.Apps.Entities/Apps/Invitation/InvitationEmailEventConsumer.cs
+++ b/src/Squidex.Domain.Apps.Entities/Apps/Invitation/InvitationEmailEventConsumer.cs
@@ -55,6 +55,11 @@ namespace Squidex.Domain.Apps.Entities.Apps.Invitation
 
         public async Task On(Envelope<IEvent> @event)
         {
+            if (!emailSender.IsActive)
+            {
+                return;
+            }
+
             if (@event.Payload is AppContributorAssigned appContributorAssigned && appContributorAssigned.Actor.IsSubject)
             {
                 var assignerId = appContributorAssigned.Actor.Identifier;
diff --git a/src/Squidex.Domain.Apps.Entities/Apps/Invitation/InvitationEmailSender.cs b/src/Squidex.Domain.Apps.Entities/Apps/Invitation/InvitationEmailSender.cs
index ac92cdc63..867111fb8 100644
--- a/src/Squidex.Domain.Apps.Entities/Apps/Invitation/InvitationEmailSender.cs
+++ b/src/Squidex.Domain.Apps.Entities/Apps/Invitation/InvitationEmailSender.cs
@@ -21,6 +21,11 @@ namespace Squidex.Domain.Apps.Entities.Apps.Invitation
         private readonly ISemanticLog log;
         private readonly InvitationEmailTextOptions texts;
 
+        public bool IsActive
+        {
+            get { return true; }
+        }
+
         public InvitationEmailSender(
             IOptions<InvitationEmailTextOptions> texts,
             IEmailSender emailSender,
diff --git a/src/Squidex.Domain.Apps.Entities/Apps/Invitation/NoopInvitationEmailSender.cs b/src/Squidex.Domain.Apps.Entities/Apps/Invitation/NoopInvitationEmailSender.cs
new file mode 100644
index 000000000..899d8bdb6
--- /dev/null
+++ b/src/Squidex.Domain.Apps.Entities/Apps/Invitation/NoopInvitationEmailSender.cs
@@ -0,0 +1,31 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System.Threading.Tasks;
+using Squidex.Infrastructure.Tasks;
+using Squidex.Shared.Users;
+
+namespace Squidex.Domain.Apps.Entities.Apps.Invitation
+{
+    public sealed class NoopInvitationEmailSender : IInvitationEmailSender
+    {
+        public bool IsActive
+        {
+            get { return false; }
+        }
+
+        public Task SendExistingUserEmailAsync(IUser assigner, IUser assignee, string appName)
+        {
+            return TaskHelper.Done;
+        }
+
+        public Task SendNewUserEmailAsync(IUser assigner, IUser assignee, string appName)
+        {
+            return TaskHelper.Done;
+        }
+    }
+}
diff --git a/src/Squidex/Config/Domain/EntitiesServices.cs b/src/Squidex/Config/Domain/EntitiesServices.cs
index ea4130141..df0d018fd 100644
--- a/src/Squidex/Config/Domain/EntitiesServices.cs
+++ b/src/Squidex/Config/Domain/EntitiesServices.cs
@@ -156,18 +156,23 @@ namespace Squidex.Config.Domain
             {
                 services.AddSingleton(Options.Create(emailOptions));
 
+                services.Configure<InvitationEmailTextOptions>(
+                    config.GetSection("email:invitations"));
+
                 services.AddSingletonAs<SmtpEmailSender>()
                     .As<IEmailSender>();
 
-                services.AddSingletonAs<InvitationEmailEventConsumer>()
-                    .As<IEventConsumer>();
-
                 services.AddSingletonAs<InvitationEmailSender>()
                     .AsOptional<IInvitationEmailSender>();
-
-                services.Configure<InvitationEmailTextOptions>(
-                    config.GetSection("email:invitations"));
             }
+            else
+            {
+                services.AddSingletonAs<NoopInvitationEmailSender>()
+                    .AsOptional<IInvitationEmailSender>();
+            }
+
+            services.AddSingletonAs<InvitationEmailEventConsumer>()
+                .As<IEventConsumer>();
         }
 
         private static void AddCommandPipeline(this IServiceCollection services)
diff --git a/src/Squidex/appsettings.json b/src/Squidex/appsettings.json
index 0c54dad3d..afb699604 100644
--- a/src/Squidex/appsettings.json
+++ b/src/Squidex/appsettings.json
@@ -89,11 +89,12 @@
       /*
        * Always use SSL if possible.
        */
+
       "enableSsl": true,
       /*
        * The port to your email server.
        */
-      "port": 587
+      "port": 465
     },
     "invitiations": {
       /*
diff --git a/tests/Squidex.Domain.Apps.Entities.Tests/Apps/Invitation/InvitationEmailEventConsumerTests.cs b/tests/Squidex.Domain.Apps.Entities.Tests/Apps/Invitation/InvitationEmailEventConsumerTests.cs
index c2134ea1a..90d799c39 100644
--- a/tests/Squidex.Domain.Apps.Entities.Tests/Apps/Invitation/InvitationEmailEventConsumerTests.cs
+++ b/tests/Squidex.Domain.Apps.Entities.Tests/Apps/Invitation/InvitationEmailEventConsumerTests.cs
@@ -31,6 +31,9 @@ namespace Squidex.Domain.Apps.Entities.Apps.Invitation
 
         public InvitationEmailEventConsumerTests()
         {
+            A.CallTo(() => emailSender.IsActive)
+                .Returns(true);
+
             sut = new InvitationEmailEventConsumer(emailSender, userResolver, log);
         }
 
@@ -48,6 +51,26 @@ namespace Squidex.Domain.Apps.Entities.Apps.Invitation
                 .MustNotHaveHappened();
         }
 
+        [Fact]
+        public async Task Should_not_send_email_if_sender_not_active()
+        {
+            var @event = Envelope.Create(CreateEvent(RefTokenType.Subject, true));
+
+            A.CallTo(() => emailSender.IsActive)
+                .Returns(false);
+
+            A.CallTo(() => userResolver.FindByIdOrEmailAsync(assignerId))
+                .Returns(Task.FromResult<IUser>(null));
+
+            await sut.On(@event);
+
+            A.CallTo(() => userResolver.FindByIdOrEmailAsync(A<string>.Ignored))
+                .MustNotHaveHappened();
+
+            A.CallTo(() => emailSender.SendNewUserEmailAsync(A<IUser>.Ignored, A<IUser>.Ignored, appName))
+                .MustNotHaveHappened();
+        }
+
         [Fact]
         public async Task Should_not_send_email_if_assigner_not_found()
         {