C#

<br />
				//introduce ourselves<br />
				buf.Append("HELO ");<br />
				buf.Append(host);<br />
				con.SendCommand(buf.ToString());<br />
				con.GetReply(out response, out code);<br />
				buf.Length = 0;<br />
<br />
if(!AuthLoginPlain(con, user, password)) {<br />
// Failed<br />
con.Close();<br />
throw .... // throw an error<br />
}<br />
<br />
...<br />
<br />
<br />
		private bool AuthLoginPlain(SmtpConnection con, string user, string pass)<br />
		{<br />
			//Envia o comand AUTH LOGIN<br />
			StringBuilder buf = new StringBuilder();<br />
			byte [] b_user = System.Text.Encoding.ASCII.GetBytes(user);<br />
			byte [] b_pass = System.Text.Encoding.ASCII.GetBytes(pass);<br />
			string response;<br />
			string res;<br />
			string data;<br />
			int code;<br />
			buf.Append("AUTH LOGIN");<br />
			con.SendCommand(buf.ToString());<br />
			con.GetReply(out response, out code);<br />
			buf.Length = 0;<br />
			if(code == 334) <br />
			{<br />
				//pega ultima resposta menos o codigo de resposta<br />
				response = response.Substring(4);<br />
				res = System.Text.Encoding.ASCII.GetString(Convert.FromBase64String(response));<br />
				if(res == "Username:") <br />
				{<br />
					//envia o nome de <br />
					data = Convert.ToBase64String(b_user);<br />
					buf.Append(data);<br />
					con.SendCommand(buf.ToString());<br />
					con.GetReply(out response, out code);<br />
					buf.Length = 0;<br />
				}<br />
				if(code != 334) <br />
				{<br />
					return false;<br />
				}<br />
				response = response.Substring(4);<br />
				res = System.Text.Encoding.ASCII.GetString(Convert.FromBase64String(response));<br />
				if(res == "Password:") <br />
				{<br />
					// manda senha em plain<br />
					data = Convert.ToBase64String(b_pass);<br />
					buf.Append(data);<br />
					con.SendCommand(buf.ToString());<br />
					con.GetReply(out response, out code);<br />
					if(code != 235) <br />
					{<br />
						// falhou!<br />
						return false;<br />
					}<br />
					// se chegou até aqui, ok!<br />
					return true;<br />
				}<br />
			}<br />
			return false;<br />
		}<br />

private string pcname = ".";

[Category("Interface Options")]
[TypeConverter(typeof(ControlOptions.MachineConvertor))]
public string MachineName 
{
   get {return pcname;}
   set {pcname = value;
      sname = value;
   }
}

[DllImport("Netapi32")]
private static extern int NetServerEnum(
   string servername, //must be null
   int level, //101
   out int buffer,
   int maxlen, //out
   out int entriesread, //out
   out int totalentries, //out
   int servertype, //in 3 = all
   string domain, //null primary
   int resumehandle); //must be 0

[DllImport("Netapi32")]
private static extern int NetApiBufferFree(IntPtr ptr);

[StructLayout(LayoutKind.Sequential)]
class ServerInfo 
{
   public int platformid;
   [MarshalAs(UnmanagedType.LPWStr)]
   public string name;
   public int majorver;
   public int minorver;
   public int type;
   [MarshalAs(UnmanagedType.LPWStr)]
   public string comment;
}

class MachineConvertor : TypeConverter 
{
   public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
   {
      int eread, etot, buffer;
      int l = 20;     
      int size = Marshal.SizeOf(typeof(ServerInfo));
      int res = NetServerEnum(
         null, 
         101, 
         out buffer, 
         size * l, 
         out eread, 
         out etot, 
         3, 
         null, 
         0);
            
      int  p = buffer;
      ArrayList arr = new ArrayList(etot);
      for (int i = 0; i < eread; i++)
      {
         ServerInfo si = Marshal.PtrToStructure((IntPtr) p, typeof(ServerInfo)) as ServerInfo;   
         arr.Add(si.name);
         p += size;
      }
      
      res = NetApiBufferFree((IntPtr) buffer);
      return new StandardValuesCollection(arr);
   }

   public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
   {
      return true;
   }
}