How to open & forward ports on a Cisco 831 router

I am setting up a mail server for a client and I need to open port 25 and forward it to the new mail server. They have a Cisco 831 router. They have a couple of VPN connections which makes the router configuration a little more complex. I attached the running config. If you could tell me what lines to modify or add to accomplish this I would appreciate it.
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You need to add a line to ACL 111 to permit SMTP and you need a static NAT rule to allow the mail in.

access-list 111 permit tcp any host 6x.2xx.5x.1xx eq 25

ip nat inside source static tcp [inside ip of mail server] 25 6x.2xx.5x.1xx 25

Assuming 6x.2xx.5x.1xx to be the outside IP address of the router.
fkoyerAuthor Commented:
I haven't had a chance to test this but it looks like what I needed to know so I'm going to go ahead and award the points. Thanks for the quick reply.
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