Can't connect to mail server - DNS Server settings?

Hello:
Let me preface this question by saying that computer networking is not my strong suit.
Last week I moved our web hosting from our ISP to Lunarpages; our domain is marshall-arts.net. I set up some POP email accounts on our new mail servers and was able to successfully send and receive email wirelessly using our G4 ibook. However, none of our networked desktop systems could connect to our new mail server, although they could connect to our ISP's mail server; they also have no problem connecting to the web. The mail server and user names were identical between the desktop systems and the ibook. But upon closer examination of the TCP/IP settings of the ibook I found that the ibook had 209.253.113.10 entered into the DNS Servers (optional) field. That field was blank in the desktop systems. Once I entered that address into the DNS Servers field on the desktop systems they had no problem connecting to our Lunarpages mail servers.
Here's our setup, as best as I can describe it:
We have an AirPort Extreme connected to our DSL router. It's connected via ethernet, configured manually with a static IP, router and DNS server addresses provided by our ISP. It's set to distribute IP addresses with the AirPort client computers sharing a single IP address using DHCP and NAT (10.0.1.1. addressing). It's connected via ethernet to a Linksys gigabit ethernet switch to which we have connected three desktop Macs running OS 10.3.x and 10.4.x.
The TCP/IP of the three desktop systems and the ibook are configured Using DHCP.
As I wrote above, only the ibook had an address entered into the DNS Servers field, 209.253.113.10. This doesn't correspond to anything our ISP provided (those addresses are entered in the AirPort Extreme.) I have no idea where it came from.
So I have two questions:
Would that address have been generated automatically while setting up the AirPort connection on the ibook?
Why would that supposedly optional DNS Server address be required for me to connect to our new mail servers (but not our old ISP mail servers)?
Thank you.
Shawn Marshall
Marshall Arts Motion Graphics
Dual 2.5 Ghz G5 Mac OS X (10.4.7)
Dual 2.5 Ghz G5 Mac OS X (10.4.7)

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