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Changing NS and MX records.

I posted something about this before but I had some additional questions.

We have an Exchange server here onsite. We have an ISP that is also hosting our website offsite.

I am switching our ISP and web hosting to two different companies. (our domain name is with another different company, I would have to change the NS records to reflect the new hosting co.)

Now, to prevent any downtime, or a minimal amount of it, could I have our MX records changed to our old IP and also have our new IP listed as well and do the same with our NS records, so that during the switch to our new ISP and hosting company we would have little to no downtime and if I encounter any problems I could just switch back to the old ISP and have everything keep functioning?

Also, is our MX record just our IP Address where the Exchange server resides? I'm not exactly sure on that.
I know our NS records will have to point to the new hosting co.
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Josh
Asked:
Josh
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1 Solution
 
MarakushCommented:
The easy way I have found it to make a copy of your website and host it at the new provider, while leaving the existing site up for about a week longer. This will mean that ppl with cached NS records for your domain won't even notice the cut over as its happening. Same goes for the MX records. You shouldn't notice much disruption. The only problem you might see is reverse lookup of your domain during the cut over.
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JoshSystems AdministratorAuthor Commented:
ok, Do I need to set up reverse DNS (for exchange) with our new ISP or is this not necessary, because under my administrative options for our new ISP account I can change that. I am just unsure if I need to or not.
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DrDave242Commented:
I would recommend setting up reverse lookup, as some mail servers will not accept mail originating from servers with no corresponding PTR records.
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MarakushCommented:
DrDave242 is correct, My servers will not respond to server that don't have their reverse lookup zone configured. I do that to help with the spam issue.
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JoshSystems AdministratorAuthor Commented:
Ok, I think I have it all straight, it is just a bit confusing since I am moving us to a new web host, our domain is with another company and we are changing our ISP basically all at the same time so I am trying to coordinate all this so everything goes smooth. So I will be starting Friday evening and hope that all is well on Monday morning. Unless there is another way it can be done without interruption. I've only done one of these at a time before, not everything all at once.
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MarakushCommented:
Good luck Nickerson!
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