The method must be invoked separately for each MIME type.
**Type**: boolean
**Parameters**
| Name | Type | Value |
| sessionId | String | ID of the session |
| mailingId | long | ID of the mailing |
| mimeType | String | MIME type (text/plain or text/html) of the mailing |
**Return values**
true: Click tracking is activated
false: Click tracking is deactivated
**Code structure**