A large pile of shit that I recently discovered in an open source code base from CodePlex.

AwfulPileOfShit.cs

    public void SendMessage()
    {
      lock(this)
      {
        //do some sanity checking
        if(host == null || host.Trim().Length == 0)
        {                   
          throw new Exception("No host specified.");
        }
        if(from == null || from.Trim().Length == 0)
        {
          throw new Exception("No from address.");
        }
        if(to.Count == 0)
        {
          throw new Exception("No to address.");
        }
        //set up initial connection
        con = new SmtpConnection();
        if(port <= 0) port = 25;
        con.Open(host, port);
        StringBuilder buf = new StringBuilder( 8192 );
        string response;
        int code;
        
        //read greeting
        con.GetReply(out response, out code);
        
        //introduce ourselves
        buf.Append("HELO ");
        buf.Append(host);
        con.SendCommand(buf.ToString());
        con.GetReply(out response, out code);
        buf.Length = 0;
        buf.Append("MAIL FROM:<");
        buf.Append(from);
        buf.Append(">");
        con.SendCommand(buf.ToString());
        con.GetReply(out response, out code);
        buf.Length = 0;     
        
        //set up list of to addresses
        foreach(object o in to)
        {
          buf.Append("RCPT TO:<");
          buf.Append(o);
          buf.Append(">");
          con.SendCommand(buf.ToString());
          con.GetReply(out response, out code);
          buf.Length = 0;
        }
        
        //set headers
        con.SendCommand("DATA");
        con.SendCommand("X-Mailer: smw.smtp.SmtpEmailer");
        DateTime today = DateTime.Now;      
        buf.Append("DATE: ");
        buf.Append(today.ToLongDateString());
        con.SendCommand(buf.ToString());
        buf.Length = 0;
        buf.Append("FROM: ");
        buf.Append(from);
        con.SendCommand(buf.ToString());
        buf.Length = 0;
        buf.Append("TO: ");
        buf.Append(to[0]);
        for(int x = 1; x < to.Count; ++x)
        {
          buf.Append(";");
          buf.Append(to[x]);        
        }
        con.SendCommand(buf.ToString());
        buf.Length = 0;
        buf.Append("REPLY-TO: ");
        buf.Append(from);
        con.SendCommand(buf.ToString());
        buf.Length = 0;     
        buf.Append("SUBJECT: ");
        buf.Append( subject );
        //buf.Append(subject);
        con.SendCommand(buf.ToString());        
        buf.Length = 0;
        
        //declare mime info for message
        con.SendCommand("MIME-Version: 1.0");
        if( !sendAsHtml || 
          (sendAsHtml && ((SmtpAttachment.inlineCount > 0) || (SmtpAttachment.attachCount > 0)))
          )
        {
          con.SendCommand("Content-Type: multipart/mixed; boundary=\"#SEPERATOR1#\"\r\n");        
          con.SendCommand("This is a multi-part message.\r\n\r\n--#SEPERATOR1#");
        }
        if(sendAsHtml)
        {
          con.SendCommand("Content-Type: multipart/related; boundary=\"#SEPERATOR2#\"");        
          con.SendCommand("Content-Transfer-Encoding: quoted-printable\r\n");   
          con.SendCommand("--#SEPERATOR2#");
          
        }
        if(sendAsHtml && SmtpAttachment.inlineCount > 0)
        {
          con.SendCommand("Content-Type: multipart/alternative; boundary=\"#SEPERATOR3#\"");        
          con.SendCommand("Content-Transfer-Encoding: quoted-printable\r\n");   
          con.SendCommand("--#SEPERATOR3#");
          con.SendCommand("Content-Type: text/html; charset=" + m_strCharSet );       
          con.SendCommand("Content-Transfer-Encoding: quoted-printable\r\n");   
          con.SendCommand(EncodeBodyAsQuotedPrintable());
          con.SendCommand("--#SEPERATOR3#");
          con.SendCommand("Content-Type: text/plain; charset=" + m_strCharSet);                 
          con.SendCommand("\r\nIf you can see this, then your email client does not support MHTML messages.");
          con.SendCommand("--#SEPERATOR3#--\r\n");
          con.SendCommand("--#SEPERATOR2#\r\n");
          SendAttachments(buf, AttachmentLocation.Inline);          
        }
        else
        {
          if(sendAsHtml)
          {
            con.SendCommand("Content-Type: text/html; charset=" + m_strCharSet);        
            con.SendCommand("Content-Transfer-Encoding: quoted-printable\r\n");   
          }
          else
          {
            con.SendCommand("Content-Type: text/plain; charset=" + m_strCharSet);       
            con.SendCommand("Content-Transfer-Encoding: quoted-printable\r\n");   
          }
          con.SendCommand(EncodeBodyAsQuotedPrintable());
        }
        if(sendAsHtml)
        {
          con.SendCommand("\r\n--#SEPERATOR2#--");
        }
        if(SmtpAttachment.attachCount > 0)
        {
          //send normal attachments
          SendAttachments(buf, AttachmentLocation.Attachment);
        }
        //finish up message
        con.SendCommand("");
        if(SmtpAttachment.inlineCount > 0 || SmtpAttachment.attachCount > 0)
        {
          con.SendCommand("--#SEPERATOR1#--");
        }
        con.SendCommand(".");
        con.GetReply(out response, out code);
        con.SendCommand("QUIT");
        con.GetReply(out response, out code);
        con.Close();
        con = null;
        if(OnMailSent != null)
        {
          OnMailSent();
        }
      }
    }