After nameserver change, mx records are wrong

While trying to add a CNAME to a customer's DNS records, I was told that I had to change the nameservers to  the hosts in order for the change to take affect (dotster).  I did so, but the problem is that the MX records listed are IP adresses & not domains names.  Aperently, the old nameservers (dns1/dns2.centrepc.net) accepted IP numbers as only IP numbers, while Dotster doesn't & requires domain names.  I got the nameservers switched back to dns1/2.centrepc.net, but when I did an mxlookup, they're reporting being different than the original mx records.  I can't acces whatver service the nameservers are under to change them, and I don't know what the proper domain name is for the smtp server of the original records!  I'm stuck! HELP!
bryanchandlerAsked:
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Chris DentPowerShell DeveloperCommented:
> Aperently, the old nameservers (dns1/dns2.centrepc.net) accepted IP numbers as only IP numbers,
> while Dotster doesn't & requires domain names.

MX records must point to mail server names to be RFC compliant.

> I can't acces whatver service the nameservers are under to change them, and I don't know what
> the proper domain name is for the smtp server of the original records!  I'm stuck! HELP!

You mean the MX records are wrong and you cannot correct them?

Apologies if I haven't understood, but if that is the case you need to find someone that can modify them.

Chris
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bryanchandlerAuthor Commented:
I understand that MX records must be RFC compliant & a FQDN, but this is the reality I'm in.  It may be that this domain was registered in the late 90's  or whatever, but the only MX record that shows up in Dotster is an ip address.  
When I changed the nameservers back FROM Dotsters TO what they were originally, MXLookup reports them to be a FQDN that's IP ISN'T what is shown in Dotster.
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Chris DentPowerShell DeveloperCommented:

> I understand that MX records must be RFC compliant & a FQDN, but this is the reality I'm in.

I don't mind, you only need to know because it will effect mail delivery. That is, some systems will simply refuse to deliver mail to you.

> When I changed the nameservers back FROM Dotsters TO what they were originally, MXLookup
> reports them to be a FQDN that's IP ISN'T what is shown in Dotster.

MX Lookup from where? Is that a website?

It's almost certainly a caching issue. That is, the system you're asking as a cached response either for where your domain is hosted (the NS records which have changed), or for the MX record itself.

It will potentially correct over time, but it's always nice to check that really is the case.

Perhaps try running:

nslookup -q=mx yourdomain.com 4.2.2.4

4.2.2.4 is a DNS server which belongs to Verizon, a neutral third party in this case. We just want it to tell us its opinion of the current MX records.

Chris
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bryanchandlerAuthor Commented:
I eventually moved the domain over to Google Apps for Business, and mail is flowing now.  I however never found out why I had IP addresses in my MX records.  
This is how I found the MX records at Dotster, but the nameservers weren't Dotster's NS.  Changing them killed email until I could enter valid hostnames for the MX records.
Lesson learned.
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