mx record and forward mail to exchange server

[damasistem]

I have a exchange server (installed virtual machine (windows server 2003) and also this machine is dns server) and I can access the exchange server by using IP like -- xxx.xxx.xxx.xxx/exchange.

I want to forward mails in ispcp webmail to this exchange server.

I added a mx record by using "DNS zone's records" in ispcp. like below:
xxxxxx.com xxxxx.com. IN MX 10 xxx.xxx.xxx.xxx/exchange.

but this doesnt work.

Actually main question is that how can I forward mails in ispcp to exchange server? (I am new user of ispcp)