Possible enumeration values:
| Name | Value | Description |
|---|---|---|
| All |
0 |
All Email Message Classes |
| Community |
1 |
Community-based Emails |
| Promotion |
2 |
Promotional Emails |
| Social |
3 |
Social Emails |
| Following |
4 |
Emails related to items the user is following |
| Newsletter |
5 |
Smart Newsletter Emails |