**Type**: boolean[ ]
**Parameters**
| Name | Type | Value |
| sessionId | String | ID of the session |
| recipientListIds | long[ ] | IDs of the recipient lists |
| recipientId | String | ID of the recipient |
**Return values**
For each recipient list:
true: Recipient already exists
false: Recipient does not exist or an entry exists but the opt-in process has not been finished yet (i.e., the double opt-in link has not been clicked)
**Code structure**