This content is no longer actively maintained. It is provided as is, for anyone who may still be using these technologies, with no warranties or claims of accuracy with regard to the most recent product version or service release. The CdoDSNOptions enumeration is used in conjunction with the DSNOptions Property to set delivery status notification (DSN) status flags for the message.
Microsoft CDO for Exchange 2000 Library
DLL Implemented In
Name Value Description
No Delivery Status Notification (DSN) commands are issued.
No DSN commands are issued.
Return a DSN if delivery fails.
Return a DSN if delivery succeeds.
Return a DSN if delivery is delayed.
Return a DSN if delivery succeeds, fails, or is delayed.