There are three user-defined data types necessary to use MAPI:
MAPIMessage defines the structure of an actual mail message including its text, subject, and date:
Type MapiMessage Reserved As Long Subject As String NoteText As String MessageType As String DateReceived As String ConversationID As String Flags As Long RecipCount As Long FileCount As Long End Type
MAPIRecip defines a recipient (addressee) of a message including the name and address:
Type MapiRecip Reserved As Long RecipClass As Long Name As String Address As String EIDSize As Long EntryID As String End Type
MAPIFile defines a file attachment to a message including the filename, the name as it appears in the message, and its position in the message.
Type MapiFile Reserved As Long Flags As Long Position As Long PathName As String FileName As String FileType As String End Type