Hello Aaron. I send the letter by means of CDO. It's impossible to use Outlook COM Library for me.. (restriction in a technical project) What i do: //CDO MAPI.Session oSession = new MAPI.Session(); oSession.Logon(Missing.Value, Missing.Value, true, true, Missing.Value, Missing.Value, Missing.Value); MAPI.Folder oFolder = (MAPI.Folder)oSession.Outbox; MAPI.Messages oMessages = (MAPI.Messages)oFolder.Messages; MAPI.Message oMsg = (MAPI.Message)oMessages.Add(Missing.Value, Missing.Value, Missing.Value, Missing.Value); // Redemptoin SafeMailItem SafeItem = new SafeMailItemClass(); oMsg.Subject = "Hello!"; oMsg.Text = "Hello!"; SafeItem.Item = oMsg; SafeItem.Recipients.Add("xxx@xxx.xxx"); SafeItem.Recipients.ResolveAll(); //!!! oSession.DeliverNow(); //!!! MAPIUtils ut = new MAPIUtilsClass(); ut.DeliverNow((int)rdoFlagIcon.olRedFlagIcon, (int)this.Handle); SafeItem.Send(); oSession.Logoff(); Letters remain in a folder Proceeding... And how to make that they have automatically gone and have got in folder Sent? I can not understand in what a problem. !!! - this code don't help...