New External IPs for exchange

Hi My new ISP will give me a new public IP block, how can affect my exchange if I use the new block?
PLCITSAsked:
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Hypercat (Deb)Connect With a Mentor Commented:
All you need to do is change the host (A) record for your mail server on your public DNS zone. IOW, if your old IP address was 1.2.3.4, then in your public DNS zone there would be a host record for mailserver.mydomain.com with the IP address of 1.2.3.4.  So, if your new ISP assigns you an IP of 5.6.7.8, then all you need to do is change 1.2.3.4 to 5.6.7.8 for that host record.  Be aware that the change might be visible to you within a few minutes, but it can take as much as 24-48 hours for the change to be propagated throughout the Internet. Most of your clients or customers who regularly send you email will get the change fairly quickly, though.
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Will SzymkowskiConnect With a Mentor Senior Solution ArchitectCommented:
You need to contact your ISP and make sure that you have a your reverse DNS (PTR) record resolving to mail.domain.com (A) host record. You will also want to configure your firewall and or external smart host for the new IP/s.

Will.
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dsnegi_25decConnect With a Mentor Commented:
1) You need to change IP addresson where MX record have configured.
2) You need to ask ISP to create PTR record.
3) You need to change new IP address into firewall or gateway.
4) You have to inform your clients , if they are using your gateway to send emails.
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