Email::getHeader

protected function getHeader()
{
	$activityId = $this->getAssociatedEntityModel()->get('ID');

	static $associatedActivityId;
	static $header;

	if (is_null($header) || $activityId !== $associatedActivityId)
	{
		$associatedActivityId = $activityId;
		$header = Message::getHeader([
			'OWNER_TYPE_ID' => (int)$this->getAssociatedEntityModel()->get('OWNER_TYPE_ID'),
			'OWNER_ID' => (int)$this->getAssociatedEntityModel()->get('OWNER_ID'),
			'ID' => $this->getAssociatedEntityModel()->get('ID'),
			'SETTINGS' => $this->getAssociatedEntityModel()->get('SETTINGS'),
		])->getData();
	}
	return $header;
}