Just make sure you aren't confusing nameservers for DNS records. I host all of my DNS separate from my registrar, so the only thing that I can do with my registrar (GoDaddy in this case) is to change the name servers, which in effect tell it "where" to go to find DNS information for the domain. I guess if you are hosting your site through the registrar, then it might all be in one place.
Unless someone isn't receiving email for a domain, there will always be separate DNS records for the web/email. It might be possible that they point to the same IP, but even that is unlikely. The nameservers will be Yourdomain.com NS1.somednshost.net Yourdomain.com NS2.somednshost.net This you won't really want to change who is hosting your DNS. However, if you do have access to the DNS records, and see something like: Host Points to www.yourdomain.com xxx.xxx.xxx.xxx (the IP address of the host) Then you can probably safely modify this record to point to the new host. If you don't see that, or aren't sure, then you will probably just want to leave it to the network guys, or ask the registrar/host for more help. It's something that can be so easy yet have such a negative effect on things if it isn't right. HTH! Todd -----Original Message----- From: wwwpages [mailto:[EMAIL PROTECTED] Sent: Friday, November 10, 2006 6:02 AM To: [email protected] Subject: RE: [wdvltalk] Microsoft Exchange & DNS Thanks for the reply BJ. I sort of only understood half of what you said, but I think I'll forward your comments to the network guys. Hopefully they know all this already, but they don't seem to be confident, hence my question. All I understand is that there are DNS records at the registrar which I can adjust to point the web domain to the new web hosts. I didn't know there were separate ones for email and web. I also don't know where to find A records or MX records? -----Original Message----- From: Bj [mailto:[EMAIL PROTECTED] To add to Todd's reply - Exchange is an internal mail system, and whatever you do to the company's Internet connection, Exchange will carry on working (internally). It's usually however configured with an Internet mail gateway that allows messages to be sent and received to and from external addresses using a domain name that resolves to an IP address. The way external email finds [EMAIL PROTECTED] is by going to the DNS record for yourcompany.com and getting the IP address of the gateway server from the MX record(s). There are separate DNS records for Web pages and mail, and they can point (if required) to different places. The A records point to IP addresses for the domain eg mysite.com CNAME records are used where the IP address is already defined by an A record to provide pointing for directory prefixes such as www or ftp MX records provide pointing for email. You can have more than one, pointing to different addresses, with different priority levels so that email gets through to a backup server if the main one is down. If your client has existing MX records that directly specify an IP address rather than a URL, then adding or changing an A record for Web pages shouldn't affect the flow of email at all. Even if you move the domain name to a different ISP and move the DNS records to their nameserver, as long as you keep the MX records same as they are now then there shouldn't be any disruption because the cached records on Internet routers and the IP address they pick up once the cache expires should be the same. Only if the IP address of the mail server changes do you have a problem. Or, if the DNS records for mycompany.com look like this and you change the A record to a different IP then you have a problem: IN A 111.112.113.114 MAIL IN CNAME mycompany.com MX IN 10 mail.mycompany.com Talk to their ISP early about what you want to do and ask for the DNS record details. Bj -----Original Message----- Hi guys, I have a client who uses Microsoft Exchange for their company's email services. We are in the process of developing a new website for them - at the moment they do not have a website at all. My concern is that if we change the DNS settings to point their domain to a new host for their website that this will disrupt their email services. I have no idea about Exchange or how it works. They have some network guys they contract to support their systems and they advised that changing the DNS will have no affect on their internal email. Can anyone confirm that this is the case? I am just concerned that if we make such a critical change that it will indeed bring down their email systems. Does someone have some knowledge of Exchange and DNS that can advise? 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