Possible enumeration values:
| Name | Value | Description | 
|---|---|---|
| None | 
                     0  | 
                |
| Immediate | 
                     1  | 
                |
| HourlyDigest | 
                     2  | 
                |
| DailyDigest | 
                     4  | 
                |
| WeeklyDigest | 
                     8  |