If your IP range changes then you should change DNS mx records to reflect the new IPs of your mail servers
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Will a new IP address affect my E-Mail deliverability?
I am in the position where my webhost is merging with another company. I currently have a /29 IP block allocated to my servers since 2003. My websites are fairly large, and we use Email as a primary communication method to our 250k+ subscribers. Due to the merge, the new owner is unsure at this time if they can transfer our IP range over to their systems. First, would they be able to transfer our /29 block to their systems?
If forced to obtain a new IP range, will my E-Mail servers have difficulty in sending out 250k Emails per day, as we would be seen as a "new" IP address mailing to the Internet, even though our domain has been Emailing since 2003 and we have established a positive reputation on our current IP and domain?
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Answers
Changing A record of your mail server could take some time to refresh - few hous to max three days.
(Normally in hours).
It is not "by book" but if you want to speed up things, create new A record mail2.domain.com ( existing one is mail.domain.com). It will propagate imediately, because it is not listed in any DNS server and all DNS servers will ask your primary DNS server about location of "new" server. You also need to create additional mx record, that is directing to new mail2 server with higer priority. At the same time you should also correct values of the main (mail.domain.com) A record to new IP adress. After few days retire mail2 records.
When change is to occur you should set TTL of the domain to very small values (<1 hour) so that any changes will propagate sooner.
Remember that you have to change SPF record if you add a new server mail2.domain.com as davorin suggested.
A new IP for the email server is no issue - your current IP is not listed anywhere as good (unless you are whitelisted at some companies - probably not) it is just not listed as bad (spammer - blocked). The new IP will also not be listed as bad when you start with it so you will have no problems.
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by: davorinPosted on 2009-11-07 at 03:19:26ID: 25765822
I think that they should not have problems moving IP to their equipment.
(If you are moving to new location, maybe you could ask your ISP to transfer internet link to new location and leave all settings the same. Then you move all your equimpmet - as it is. But there will be some downtime. It is acceptable?).
If you change your ip address, you will have to change DNS records. For mail server A record to new IP and rDNS record of ISP link. You should have no problems with that too.