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PC Knowledge Base - Using Different DNSs for External Mail Delivery
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Exchange 2000 lets you use different DNS servers for resolving MX records. This wouldn't appear to be of much use, but it's conceivable that in organisations that do not want workstations to resolve Internet hostnames this could come in handy. A simpler way might be to add external DNSs to the IP configuration.

In the following configuration the ISP DNS has been added to the list of DNS servers.

Connection-specific DNS Suffix...........test.lab
Description.......................................3Com 3C905TX-based
Physical Address...............................00-60-08-53-AA-EC
Dhcp Enabled...................................No
IP Address.......................................192.168.0.5
Subnet Mask.....................................255.255.255.0
Default Gateway...............................192.168.0.254
DNS Servers....................................192.168.0.1
192.168.0.2
192.116.202.99
Primary WINS Server........................192.168.0.1
This actually does not work. Windows 2000 (and other DNS clients) resolve hostnames using the first available DNS. This means that after querying 192.16.0.1, the internal DNS server, the DNS client will not go on to ask the other DNS server for more results. It will just give up. This differs from WINS behaviour.
WINS queries are done using all available WINS servers. This sort of makes sense since DNS is a hierarchical system while WINS is a flat one.
Instead, you can configure external DNS server for Exchange 2000, using ESM, in the SMTP virtual server property pages.



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