Depends on the rest of the config, but if you can ping the vlan interface or a device in the vlan from the inside, it's working.
You have an "ip nat inside" statement on the vlan, but you didn't show your nat source statements, so I can only assume they're correct. You can try to get on the internet from your exchange server to see if nat's working correctly.
2) How can I make it very secure?
You would need an acl on your public interface to only allow traffic that you want in, and you would probably want an acl on the vlan only allowing the ports you need out from the exchange server.
3) Do I need to configure any of my public (isp) ip address on this interface?
Not if you're going to be using nat. If you have a public address, you can use static nat for the private address that's assigned to your exchange server.
The acl on the outside interface would be something like:
access-list ext PUBLIC
permit tcp any host 126.96.36.199 eq 25
access-list ext VLAN5-Exchange
permit tcp host 192.168.1.5 any eq 25
ip nat inside source static 192.168.1.5 25 188.8.131.52 25
ip nat inside source static 192.168.1.5 184.108.40.206
This would tell your router that anything coming in on 220.127.116.11 (the public ip assigned to your dialer), will get translated to 192.168.1.5. If you go with the second static, everything that's incoming on your 18.104.22.168 ip will go to the 192.168.1.5 address, and you would control the traffic that's allowed in by your PUBLIC acl. If you go with the first, it will only translate that one port (25) to that internal address.
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