Need to change the external IP address of exch 2013 server

We have 3 ip external addresses that our exchange 2013 server can use but only 2 of them were listed with our external spam filter. Our exchange server rebooted today and now the external ip address is one of the 3 that is was not listed with the external spam filter. They said it could take up to 4 hours for the change to propagate.
So my question is how can I change the external ip address of our exchange server to go to one of the 2 ip addresses that we already listed with our external spam filter company?
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vmichAsked:
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Jeremy WeisingerSenior Network Consultant / EngineerCommented:
This is going to be dependant on your firewall or whatever is doing the NATing. What do you have in place?
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Saif ShaikhServer engineer Commented:
As you said you have 3 ip external addresses that our exchange 2013 server can use but only 2 of them were listed with our external spam filter.

So during the propagation the only thing impacted would be mail flow since the third IP is not listed in the spam filter. You can route inbound email directly to from external IP (3rd one) to exchange server internal IP and not spam filter IP since the propagation will take 4 hrs.

I hope you are understanding...

Your NAT rule will have 3rd IP so any external request on the third IP will redirect the request to spam filter IP and then it will pass to the exchange server internal IP.

SO here you will exclude the entry of spam filter IP and use the public IP (third IP) of exchange server and pass all external request from exchange server public IP (third IP) to exchange server internal IP.

This is bypassing the smarthost.. Check the NAT rule as suggested by Jeremy..
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Hani AlhabshiSystems EngineerCommented:
how can I change the external ip address of our exchange server to go to one of the 2 ip addresses that we already listed with our external spam filter company?

Depend on your network infrastructure (IP4,Firewall, NAT ,VPN ,ISPs ..etc )
basically first step of your network is server IP properties, check your server Gateway IP , it decide which external ip should take  .
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