cpanel and exchange

I have a domain xyz.com pointing to a linux server.

I have changed the settings on the etc/localdomains and etc/remotedomains files to treat the xyz.com as a remote domain, so that all mails coming to the server for the domain xyz.com get forwarded to the customer's exchange ip address.

In this sense, my server is actually acting as a gateway between the ISP and the client's Exchange.

Is there any way to filter the mails being redirected by my server, to check for viruses and other spam, before having it go to the customer's IP ?

 

 

 

 

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