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 -----
From: "Todd Richards" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Tuesday, November 07, 2006 3:50 AM
Subject: RE: [wdvltalk] Microsoft Exchange & DNS
Well, maybe I'm missing something. If you are just changing the A record of
the domain name to point to the IP of the new website - and that's it - then
everything should be fine. However, if you are going to make a "critical"
change, such as changing the name servers, then you need to make sure you
are prepared.
Todd
-----Original Message-----
From: wwwpages [mailto:[EMAIL PROTECTED]
Sent: Monday, November 06, 2006 7:11 PM
To: [email protected]
Subject: [wdvltalk] Microsoft Exchange & DNS
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?
Thanks in advance
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