This method can only be applied to mailings of type REGULAR
Sets the target group id of the mailing with the provided id.

Example

POST https://api.maileon.com/1.0/mailings/1/targetgroupid
Authorization: Basic XXXXXXXXXXXXXXX
Content-Type: application/vnd.maileon.api+xml; charset=utf-8

<?xml version="1.0" encoding="UTF-8"?>
<targetgroupid>2</targetgroupid>


INFO: 
Status: 204 No Content