CF Can't Connect To Mail Server

I have been running CF 8 since release and generally no
problems. Now, it can't connect to our mail server and there
appears to be no reason. Here's the setup: We have CF 8 Standard on
Win 2003 server. The same box runs SmarterMail 4.3.
When I try to verify connection settings in CF Administrator,
it fails, using all of the same settings that worked 2 hours ago.
I've tried restarting the CF service and that didn't help.
Any ideas are much appreciated!

> it fails, using
> all of the same settings that worked 2 hours ago.
Something has changed in your config.
It might not have been you who changed it, so ask around.
THis sort of thing doesn't just "stop working", without
intervention of
some description.
Have you checked your SMTP server is responsive?
Have you given the system a reboot (it is Windows after all,
so this is
almost the first troubleshooting step).
Is you mail server set to relay email for the CF server? (NB:
do NOT set
an OPEN relay. That would be bad).
Have your relay settings, or login creds changed?
Has anyone been fiddling with your firewall or port filters
or anything?
Have you asked your mail admin what they've been doing?
There's really a lot of things you could investigate and
report back on, I
think.
Adam

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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.
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Marshall Arts Motion Graphics
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