Mailcow + PMG make sense?

Hi,

I am running a Mailcow instance in a VM on my cluster and it is going great.

But, me being me and my cluster being a home lab and no commercial operation, I am always trying out new things, playing around.

Now I am wondering whether there would be any benefit in setting up a Proxmox Mail Gateway in front of my Mailcow VM. Mailcow does have its own virus and spam killers. So would there be any benefit in spinning up PMG as well or does that not make any sense?

Thanks!