no details....just basics
Sorry not familiar with the details, but here are the basics:
If possible, configure server to have both IPs, if not then you are going to be without some email until the DNS catches up.
All you really have to do is change the MX record on your DNS. If your hosting your own, update the zone file. If not then contact your ISP, or the other DNS host you may be using.
If you can not run both IPs then in about 48 hours all the DNS severs should be updated and things will be back to normal.
Sorry I can't be more specific about changing IPs. Still new at Linux myself.
HTH
My1Cpu
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