| Member | Value | Description |
|---|---|---|
| dsnDefault | 1 | Directs the server to follow its default policy for DSN. |
| dsnDelay | 4 | Requests DSN for delayed delivery. |
| dsnFailure | 2 | Requests DSN for failure of delivery. |
| dsnFailureDelay | 5 | Requests DSN for failure or delay of delivery. |
| dsnNever | 0 | Directs the server not to send DSN under any circumstances. |
| dsnSuccess | 3 | Requests DSN for successful delivery. |
| dsnSuccessDelay | 6 | Requests DSN for success for delay of delivery. |
| dsnSuccessFailure | 7 | Requests DSN for success or Failure of delivery. |
| dsnSuccessFailureDelay | 8 | Requests DSN for success, failure, or delay of delivery. |