I think it's because PBR must be configured in interface receiving traffic; try configuring PBR on the WAN interface (obviously you can split the route-map in the routemaps: one for incoming traffic (used on WAN inertf) and one for outgoing traffic (used on VLAN 100))
The next-hop (same for IN and OUT traffic) is an Anti-SPAM gateway. Filtering SMTP traffic from customer out of the internet should pass the gateway and SPAM should be filtered out. SMTP traffic from the internet to the customer should prefiltered too. Thats the idea behind :-)
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...