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vmichFlag for United States of America

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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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Jeremy Weisinger

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 Shaikh
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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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