Mass send with outbox

using System;
using System.Threading.Tasks;
using NServiceBus;
using NServiceBus.Persistence;

class Program
{
    static void Main(string[] args)
    {
        Start().GetAwaiter().GetResult();
    }

    static async Task Start()
    {
        const string connectionString = "Data Source=.\\SQLEXPRESS;Initial Catalog=nservicebus;Integrated Security=True";

        var config = new EndpointConfiguration("OutboxMassiveSendRepro");
        config.UseTransport<SqlServerTransport>().ConnectionString(connectionString);
        config.UsePersistence<NHibernatePersistence>().ConnectionString(connectionString);
        config.EnableOutbox();
        config.SendFailedMessagesTo("error");
        config.Recoverability().Immediate(i => i.NumberOfRetries(0));
        config.Recoverability().Delayed(d => d.NumberOfRetries(0));

        var endpoint = await Endpoint.Start(config).ConfigureAwait(false);

        await endpoint.SendLocal(new TriggerMessage()).ConfigureAwait(false);

        Console.WriteLine("Press <enter> to exit.");
        Console.ReadLine();
    }
}

class Trigegr : IHandleMessages<TriggerMessage>
{
    public async Task Handle(TriggerMessage message, IMessageHandlerContext context)
    {
        for (var i = 0; i < 4000; i++)
        {
            await context.SendLocal(new ResultMessage());
        }
    }
}

class ResultHandler : IHandleMessages<ResultMessage>
{
    public Task Handle(ResultMessage message, IMessageHandlerContext context)
    {
        Console.Write(".");
        return Task.FromResult(0);
    }
}

class TriggerMessage : IMessage
{
}

class ResultMessage : IMessage
{
}