Retrieving personal distribution lists properties
    The following table describes the request body properties that you can include
    in the contactgroup API when you retrieve personal distribution lists from a user's mailbox.
| Property | Type | Description | 
|---|---|---|
| SinceTs | Timestamp | Specifies the time returned from the last retrieval of the personal
         distribution list. SinceTs is specified in epoch time format. If you want to retrieve new
         and updated distribution lists, you must specify the SinceTs to begin searching for
         records.  If the SinceTs is not specified,  BEMSretrieves all the
         personal distribution lists for a user. |