Redireccionar el trafico entrante por la WAN hacia una determinada IP de la LAN en dependencia de un alias DNS

[leo95]

I'm new to pfSense, I'd like to know how to redirect all incoming traffic to a DNS alias to an IP within my LAN. Example:

My server (pfSense): example.com

Apache Web Server: 10.10.20.10

An external client makes a request to www.example.com I want pfSense to translate www and send that traffic to 10.10.20.10. I managed to do it with NAT -> Port Forwarding but only with ports, and that does not solve my problem, since if I use 80 for www, then .. how could I create another rule that translates .. let's say ... webmail.example.com to another IP on my LAN?

Thank you very much in advance...