Search recipients

Search using segment conditions without actually creating a segment. Body contains a JSON object with `conditions`, a list of conditions as described below, and an optional `list_id`, which is a valid list ID for a list to limit the search on. Valid operators for create and update depend on the type of the field for which you are searching. - Dates: - `"eq"`, `"ne"`, `"lt"` (before), `"gt"` (after) - You may use MM/DD/YYYY for day granularity or an epoch for second granularity. - `"...