First, here are my IP and the setting of the DNS Server, and the ISP's DNS IP:
Our DNS Server IP: 184.108.40.206
ISP's DNS Server IP: 220.127.116.11
I just very trouble of the DNS problems, and I don't know what is wrong ...
From Microsoft's technet document, it ask us build up DNS Server by setting the IP is same as the DNS Server itself under "TCP/IP --> Use the following DNS server addresses:"
So I setting the IP to 18.104.22.168
It look like working .. but after someday I reading the hMailServer's Sending e-mail log, I discovered many mail quot in it waiting to send out ..
Then I open DOS command and enter "nslookup" later enter "set type=mx" and enter the domain name of the waiting to send outside e-mail domain to see what response of the DNS ...
And I discovered while using the 22.214.171.124 some domain name it can resolve and never get response ... but if I change the DNS Server under "TCP/IP --> Use the following DNS server addresses:" from 126.96.36.199 to our ISP's DNS Server 188.8.131.52 an do the nslookup again..
It can immediately response of the MX record .... so the e-mail can send outside ...
I am wonder, why using our DNS Server will can not get the response, but the ISP one can? I checked our firewall, have not block Port 53 TCP/UDP ...
And I am wonder, if the "TCP/IP --> Use the following DNS server addresses:" setted to using the ISP's DNS server not using ourself DNS Server, do it will have some bad effect???
And I discovered our DNS Server never can go to www.sis.com.hk
, but after change to using ISP's DNS server, can go to this web site..
Who can tell me what is wrong on our DNS Server's Setting?? It is not a AD Server, just same and single server using DNS, IIS, MySQL, hMailServer