Query Regarding Mail Server

[Manish Kathuria]

Vinayak Mahadevan wrote:
> When I try pinging the machine which hosts the proxy server I get a response
> but when I try pinging the machine who's ip address I have given in the dns
> server address the message I get is "network unreachable".  
> 
Is the DNS server running in your LAN or is it some external host ? In 
the latter case, your firewall must allow DNS lookups by the hosts in 
the LAN i.e. allow access to outgoing destination port 53 (udp) from the 
LAN. Ideally you should run a caching DNS server on the mail server itself.

--
Manish Kathuria
http://www.tuxspace.com/