Exchange System Manager

Exchange System Manager was present in Exchange 2003.  It is called Exchange Management Console in Exchange 2007 and higher

With respect to External DNS, are you responsible for the networking or do you have a networking team?  Who manages DNS records and SSL certificates?  Who manages firewall rules?  You need to get those answers from your internal resources.

Assuming you are responsible for it all and have taken over an environment, are you able to send and receive emails successfully?

To check DNS, run NSLOOKUP as per below:

  nslookup
  server 8.8.8.8
  set type=mx
  mydomain.com    (mydomain.com is your domain)

You will get MX records, then ping the MX records and see if it resolves to an IP that you own.  If the MX records resolves to third-party IPs then you might have a provider who might be used for anti-spam and anti-virus.  Start with this.

Hello,
There is no Exchange System Manager, now you'll use EMC - exchange management console.

In regards to checking the DNS

You will see the configuration on your DNS server.  DNS server is either using a forwarder or root hints.

Understanding forwarders: http://technet.microsoft.com/en-us/library/cc782142(WS.10).aspx

http://technet.microsoft.com/en-us/library/cc757172(WS.10).aspx

http://support.microsoft.com/kb/291382/en-us

Regards,
TonyP

Many thanks all.
Mnkhawaja,
why do you choose

server 8.8.8.8
?
Is "8.8.8.8" one IP or not?

Tony/Ashvaku,
I can see DNS server does exist within my win 2008 server in Fig 1. how to ensure it is working fine with Exchange server? I can see Forward lookup zones like that shown in Fig 2.

Suppose I have got one domain like
mycompany.co

from Godaddy.com. Do I need to add

mycompany.co

to Forward lookup zones above?
t518.png
t519.png

Any help?

Server 8.8.8.8 is the load balanced IP address of Google's DNS server.