Cisco PIX 501 port forwarding

[glenn22]

I am trying to forward any outside traffic on a specific port to a specific internal IP. For example:

I want all traffic from outside on port 25 to be forwarded to 172.21.72.250 port 25(internal IP)

it seems that the Cisco makes this extremely complex as compared to other firewall products.

[glenn22]

I've simply used the following CLI command, please tell me if this should work:

static (inside,outside) tcp interface smtp 172.21.72.250 smtp