Simple ocmod to change the default "from" address to the email configured in config_email and set the "reply to" to the email sent in the form via POST.
Tested only with version 2.1.0.2. But should work in similar releases.
<file error="skip" path="catalog/controller/information/contact.php">
<operation error="skip">
<search><![CDATA[$mail->setFrom($this->request->post['email']);]]></search>
<add position="replace"><![CDATA[
$mail->setFrom($this->config->get('config_email'));
$mail->setReplyTo($this->request->post['email']);
]]></add>
</operation>
</file>
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