Possible enumeration values:
| Name | Value | Description |
|---|---|---|
| ALL |
0 |
List all messages. |
| ALL_READ |
1 |
List messages that every recipient have read the message. |
| ALL_UNREAD |
2 |
List messages that no recipient have read the message. |
| SOME_READ |
3 |
List all messages that some of the recipients have read the message. |