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Code: Select all

    private void button1_Click(object sender, EventArgs e)
    {
     // _Connection.Open();
      Send("SMTP:[email protected]", "Test", "Text");
    } 

Code: Select all

    [StructLayout(LayoutKind.Sequential, CharSet = System.Runtime.InteropServices.CharSet.Ansi)]
    public class MapiMessage
    {
      public int Reserved = 0;
      public string Subject = string.Empty;
      public string NoteText = string.Empty;
      public string MessageType = null;
      public string DateReceived = null;
      public string ConversationID = null;
      public int Flags = 0;
      public IntPtr Originator = IntPtr.Zero;
      public int RecipCount = 0;
      public IntPtr Recips = IntPtr.Zero;
      public int FileCount = 0;
      public IntPtr Files = IntPtr.Zero;
    }

    [StructLayout(LayoutKind.Sequential, CharSet = System.Runtime.InteropServices.CharSet.Ansi)]
    public class MapiRecipDesc
    {
      public int Reserved = 0;
      public int RecipClass = 0;
      public string Name = null;
      public string Address = null;
      public int EntryIDSize = 0;
      public IntPtr EntryID = IntPtr.Zero;
    }

    [DllImport("MAPI32.DLL", CharSet = CharSet.Ansi)]
    private static extern int MAPISendMail(IntPtr lhSession, IntPtr hwndParent,
                                            MapiMessage lpMessage, int flFlags, int ulReserved);


    private static IntPtr AllocOrigin(MapiRecipDesc origin)
    {
      Type rtype = typeof(MapiRecipDesc);
      int rsize = Marshal.SizeOf(rtype);
      IntPtr ptro = Marshal.AllocHGlobal(rsize);
      Marshal.StructureToPtr(origin, ptro, false);
      return ptro;
    }
    
    private static IntPtr AllocRecips(params MapiRecipDesc[] recpts)
    {
      if (recpts.Length == 0)
        return IntPtr.Zero;

      Type rtype = typeof(MapiRecipDesc);
      int rsize = Marshal.SizeOf(rtype);
      IntPtr ptrr = Marshal.AllocHGlobal(recpts.Length * rsize);

      int runptr = (int)ptrr;
      for (int i = 0; i  Result = 26 (see Windows caption)
(I know that this is not enough code to send a mail, but it is enough to show the problem)
 
Now remove the cmment from 
 [code]// _Connection.Open();