C#: workarround to avoid incorrect subject base64 encoding (with non-ascii subjects) // using .nem mvc 5 and mvc mail and Mandrill app

HomeController.cs

using System;
using System.Net;
using System.Net.Mail;
using System.Web.Mvc;
using Mvc.Mailer;

namespace MandrilloTest.Controllers
{
    public class HomeController : Controller
    {
        /// other actions

        public ActionResult MandrilloTest()
        {
            // Wrapper
            string host = "smtp.mandrillapp.com";
            string username = "YOUR_USERNAME";
            string password = "YOUR_PASSWORD";
            string port = "587";

            // Test subjects
            string[] subjects = new string[]
            {
                "примерпример пример", "примерпримерпример", "привет привет привет"
            };

            // Sent test messages
            foreach (string subj in subjects)
            {
                // Send
                var wrapper = new SmtpClientWrapper(getSmtpClient(host, port, username, password));
                var testMailer = new Mailers.TestMailer();
                testMailer.TestEncoding(subj).Send(wrapper);
            }

            return View();
        }

        /// Create new SmtpClient
        private SmtpClient getSmtpClient(string host, string port, string username, string password)
        {
            var smtpClient = new SmtpClient(host, Convert.ToInt32(port));
            if (string.Empty != username)
            {
                var smtpCredentials = new NetworkCredential(username, password);
                smtpClient.Credentials = smtpCredentials;
            }

            return smtpClient;
        }
    }
}

TestMailer.cs

/// Proofs
/// - Forum: http://social.msdn.microsoft.com/Forums/vstudio/en-US/4d1c1752-70ba-420a-9510-8fb4aa6da046/subject-encoding-on-smtpclientmailmessage
/// - Bug: https://connect.microsoft.com/VisualStudio/feedback/details/785710/mailmessage-subject-incorrectly-encoded-in-utf-8-base64

/// You can use this code or scaffold own mailer

using System.Text;
using Mvc.Mailer;

namespace MandrilloTest.Mailers
{ 
    public interface ITestMailer
    {
        MvcMailMessage TestEncoding();

        MvcMailMessage TestEncoding(string subject);
    }
    
    public class TestMailer : MailerBase, ITestMailer
    {
        public TestMailer()
        {
            MasterName="~/Views/TestMailer/_Layout.cshtml";
        }

        public MvcMailMessage TestEncoding()
        {
            return TestEncoding("TempSubject");
        }

        public virtual MvcMailMessage TestEncoding(string subject)
        {
            return Populate(x =>
            {
                x.Subject = subject;
                x.ViewName = "TestEncoding";
                x.To.Add("test@gmail.com");
                x.BodyEncoding = Encoding.UTF8;
                x.SubjectEncoding = Encoding.Unicode; // !!! Do the trick: spoof the MailMessage (base of the MvcMailMessage) to use quoted-prinable subject encoding
            });
        }
    }
}