Is it possible to implement multiple IRequestHandlers for the same IRequest, and use pattern matching to determine which IRequestHandler to route the Request to?

[mfaulcon]

In my use case (a fax handling service), I need to have multiple implementations of the IRequestHandler<>, and differentiate as to which one will handle the request based on data inside the message. For example, my IRequest is below:

    public class ReceiveFaxCommand : IRequest<FaxReceipt>
    {
        public string FaxId { get; set; } = string.Empty;
        public string ChannelName { get; set; } = string.Empty;

        private ReceiveFaxCommand()
        { }

        public ReceiveFaxCommand(string faxId, string channelName)
        {
            FaxId = faxId;
            ChannelName = channelName;
        }
    }

For ChannelName == "This", I want the IRequestHandler<> in one implementation (specific to a particular fax services vendor) to handle the request. For ChannelName == "That", I'd like it to be handled by a different implementation. Ultimately, however, the domain model is the same across the different implementations, so it doesn't immediately make sense to me to create a different message type for each vendor or channel, especially since I'd like to be able to add additional channels without changing the code.

I know from the documentation that IRequest is designed to have at most one handler; is there a clever way I haven't thought of to have my cake and eat it too?