[in] Session handle that represents a valid Simple MAPI session. The value of the lhSession parameter must represent a valid session; it cannot be zero.
ulUIParam
[in] Parent window handle or zero, indicating that if a dialog box is displayed, it is application modal. If the ulUIParam parameter contains a parent window handle, it is of type HWND (cast to a ULONG). If no dialog box is displayed during the call, ulUIParam is ignored.
lpszMessageID
[in] The identifier for the message to be deleted. This identifier is messaging system-specific and will be invalid when MAPIDeleteMail successfully returns.
flFlags
Reserved; must be zero.
ulReserved
Reserved; must be zero.
Return Values
MAPI_E_FAILURE
One or more unspecified errors occurred while deleting the message. No message was deleted.
MAPI_E_INSUFFICIENT_MEMORY
There was insufficient memory to proceed. No message was deleted.
MAPI_E_INVALID_MESSAGE
An invalid message identifier was passed in the lpszMessageID parameter. No message was deleted.
MAPI_E_INVALID_SESSION
An invalid session handle was passed in the lhSession parameter. No message was deleted.
SUCCESS_SUCCESS
The call succeeded and the message was deleted.
Remarks
To find the message to be deleted, call the MAPIFindNext function before calling the MAPIDeleteMail function. Because message identifiers are opaque, messaging system-specific, and can be invalidated at any time, MAPIDeleteMail considers a message identifier to be valid only for the current session. MAPIDeleteMail handles invalid message identifiers by returning the MAPI_E_INVALID_MESSAGE value.