Simple MAPI can't fill address field

[Ray170]

I am trying to send email using the simple mapi. I cannot download the example because the server seems to be unavailable, so I wonder if anyone can help. The problem I have is how to handle the MapiRecipDesc field in the MapiMessage structure. Apart from this it all works except I can't fill the Address field. I have the following declarations [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)] public class MapiMessage { public uint ulReserved=0; public string lpszSubject=""; public string lpszNoteText=""; public string lpszMessageType=""; public string lpszDateReceived=""; public string lpszConversationID=""; public uint flFlags=0; public MapiRecipDesc lpOriginator; public long nRecipCount; public MapiRecipDesc lpRecips; public ulong nFileCount=0; public MapiFileDesc lpFiles; } [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)] public class MapiRecipDesc { public ulong ulReserved=0; public ulong ulRecipClass=0; public string lpszName=""; public String lpszAddress=""; public ulong ulEIDSize=0; public IntPtr lpEntryID = IntPtr.Zero; } and in the body I do public const uint MAPI_TO=1; MapiMessage message= new MapiMessage(); MapiRecipDesc recipDesc =new MapiRecipDesc(); recipDesc.ulRecipClass = MAPI_TO; recipDesc.lpszName = "Fred"; recipDesc.lpszAddress = "someone@somewhere" message.lpszSubject = "test subject"; message.lpszNoteText = "test message"; message.nRecipCount = 1; message.lpRecips = recipDesc; Ray