How to scan the local emails for SPAM and Virus

Hi Folks,

I am evaluating Proxmox Mail Gateway and is placed with my Zimbra server 7.2.2. The version acts like a mail gateway and routes the traffic for my domain example.com to zimbra server. Now I since AS/AV scanning for foreign domains is already being done by pmx mail gateway and I have disabled the AS/AV settings on zimbra, I am wondering how do I start scanning for local emails or intra-domain emails.


INTERNET -----------> mailgw.example.com------------>zim.example.com