<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../lib/internal/Magento/Framework/ObjectManager/etc/config.xsd">
	<preference for="Magento\Contact\Controller\Index\Post" type="Dinhvan\Contact\Controller\Index\Post" /> 
	<preference for="Magento\Contact\Model\Mail" type="Dinhvan\Contact\Model\Mail" />
</config>