vpn client to access some specific external host thru the vpn connection

I can access the company ' servers thru the client vpn connection. For a particular server ( smtp server ) outside of the company, I would like my access will go thru the company router ant NATed before accessing that server so I add this server IP into the ACL list of the "crypto isakmp client configuration group".

My Cisco VPN Client does show this host in the list of encrypted hosts/ routers but I cannot access this host at all.

Any advice is greatly appreciated.

Thanks, DT