trick for server (plesk) with private address behind firewall

[Victor H. Pasten V.]

Hi, I have the following trouble:

internet --> (public_ip)fw_obsd_3.4(private_ipx.x.x.1) --> 
server_plesk(private_ipx.x.x.2)
                     |_____ rdr ____________________________|

The trouble is wath server behind fw offers the folowing service:

- smtp, www, pop, etc.