Changing Exchange Server ISP

Posted on 2011-05-02
Last Modified: 2012-05-11
I am changing the ISP for our Exchange Server 2003.  The internal IP address will stay the same however the NAT IP will change to the new ISP's NAT IP.   The gateway for the exchange server needs to change as well.  What needs to be changed to ensure that I will still be able to receive and transmit emails?
Question by:jthompson01
    LVL 4

    Expert Comment

    by:Andy Keeney
    your mx records (email dns) and the 'outside ip' listed in your firewall.  
    LVL 4

    Accepted Solution

    once you have verified that your network can reach the internet with all of the new IP settings, look at the NAT routing in your firewall, and if you are using objects to define your internal exchange ip and the external ip that your exchange uses, you should only have to change that external ip address and it should work fine.   but dont forget to update your DNS records (mx especially)
    LVL 12

    Assisted Solution

    Also, don't forget rDNS for the MX record - otherwise, users may have trouble sending to certain domains

    Author Comment

    So a concise check list would be as follows:

    1:  Gateway of Exchange server must be changed
    2.  NAT Routing of new WAN IP Address back to the Exchange Server Private IP Address
    3.  Change DNS Records: MX records to send email to new WAN IP Address.

    It seems like I'm missing something.  Is this correct?
    LVL 4

    Assisted Solution

    by:Andy Keeney
    1.  change the ip address on your DNS records (this takes 2 mins to setup but anywhere from 30 mins to 12 hours to replicate best to do this on Friday evening or whenever you can potentially be down from email for up to 12 hours)
    2.  change the external ip information on your router/firewall (test to verify you can get internet traffic)
    3.  change the ip address for the object associated with exchange in your NAT routing rule

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