I want to extend /sitecore/api/ssc/EXM/Message endpoint with additional data.

I added a new class

namespace Exm.Extended
    public class MessageController : Sitecore.EmailCampaign.Server.Controllers.Message.MessageController

        //private ParentController _parent;
        public MessageController(
            ItemUtilExt itemUtil,
            ILanguageRepository languageRepository,
            IMessageVariantsService messageVariantsService,
            ILogger logger,
            IExmCampaignService exmCampaignService)

            : base(itemUtil, languageRepository, messageVariantsService, logger, exmCampaignService)

        public new Response Message( MessageContext data )
            MessageResponse response = (MessageResponse) base.Message(data);
           //todo change/extend response
            return response;

I added a custom DI configurator

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
      <configurator type="EXM.Custom.Configurator, My.Website"/>

and Replaced the default EXM MessageController with my custom one

 public void Configure(IServiceCollection serviceCollection)
container.Replace(ServiceDescriptor.Transient(typeof(Sitecore.EmailCampaign.Server.Controllers.Message.MessageController), typeof(Exm.Extended.MessageController)));

if I debug now, the custom.messagehandler constructor is hit, but the new default action does never run => still always the Sitecore.EmailCampaign.Server.Controllers.Message.MessageController.Message action.

  • I am fairly confident that you can't actually do what you are thinking you are trying to do. Question: What are you trying to achieve? Nov 14, 2020 at 5:21
  • I have renamed the Controller to CustomMessageController and rewritten the API-Controller-Url in Speak-UI call in JS => but with Sitecore 9.3 that will not work anymore - because of the removed Speak UI in EXM.
    – Mkress
    Nov 16, 2020 at 5:54
  • Yeah, that's why I'm asking what you are trying to actually accomplish by doing this. If I understood the use case, there's probably another way to achieve it. Nov 16, 2020 at 16:35

1 Answer 1


You can take a look at my answer of my question at Is there any way to update the response of a controller action by pipeline process?

It's taken my couple of days to find out this way

Hope it can help

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