SendEmailHandler.cs

using System.Collections.Generic;
using System.IO;
using System.Net.Mail;
using System.Net.Mime;
using System.Text;

using Castle.Core.Smtp;

using NServiceBus;

using Ops.Contracts.Commands;

using System.Linq;

namespace Ops
{
  public class SendEmailHandler : IHandleMessages<SendEmail>
  {
    readonly IEmailSender _emailSender;

    public SendEmailHandler(IEmailSender emailSender)
    {
      _emailSender = emailSender;
    }

    public string SmtpFromAddress { get; set; }

    public void Handle(SendeEmail message)
    {
      var mail = new MailMessage("it@will-be-overwritten", message.Recipient)
                 {
                   From = new MailAddress(SmtpFromAddress, "blah"),
                   Subject = message.Betreff,
                   SubjectEncoding = Encoding.UTF8,
                   Body = message.Text ?? message.Html,
                   BodyEncoding = Encoding.UTF8,
                   IsBodyHtml = message.Text == null
                 };

      if (message.Html != null && message.Text != null)
      {
        mail.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(message.Html,
                                                                            Encoding.UTF8,
                                                                            MediaTypeNames.Text.Html));
      }

      var streams = new List<MemoryStream>();
      try
      {
        if (message.Attachments != null)
        {
          message.Attachments.ToList().ForEach(info =>
          {
            var stream = new MemoryStream(info.Content);
            streams.Add(stream);

            mail.Attachments.Add(new Attachment(stream, info.FileName, info.MediaType));
          });
        }

        _emailSender.Send(mail);
      }
      finally
      {
        streams.ForEach(stream => stream.Dispose());
      }
    }
  }
}