Just copy Grid.php to app/code/local/Mage/Adminhtml/Block/Sales/Order/ Then appendsales_flat_order table to collection
protected function _prepareCollection() { $collection = Mage::getResourceModel($this->_getCollectionClass()); $collection->getSelect()->join('sales_flat_order', 'main_table.entity_id = sales_flat_order.entity_id',array('customer_email')); $this->setCollection($collection); return parent::_prepareCollection(); };
And a addColumn to _prepareColumns()
$this->addColumn('customer_email', array(
'header' => Mage::helper('sales')->__('Payment method'),
'index' => 'customer_email',
'filter_index' => 'sales_flat_order.customer_email',
));
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