newburns
Please stop ignoring the obvious.
Your domain egroupware.rburnsplumbing.com does not resolve correctly,
Do you have nameservers setup for that domain ?
Here is a ping result, and the IP shown (216.239.122.34) is not the IP of your server (which is 173.161.83.65)
PING c18-ss-2-lb.cnet.com (216.239.122.34) 56(84) bytes of data.
64 bytes from c18-ss-2-lb.cnet.com (216.239.122.34): icmp_seq=1 ttl=245 time=1.88 ms
64 bytes from c18-ss-2-lb.cnet.com (216.239.122.34): icmp_seq=2 ttl=245 time=2.03 ms
64 bytes from c18-ss-2-lb.cnet.com (216.239.122.34): icmp_seq=3 ttl=245 time=1.83 ms
64 bytes from c18-ss-2-lb.cnet.com (216.239.122.34): icmp_seq=4 ttl=245 time=1.87 ms
64 bytes from c18-ss-2-lb.cnet.com (216.239.122.34): icmp_seq=5 ttl=245 time=1.91 ms
--- c18-ss-2-lb.cnet.com ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4014ms
rtt min/avg/max/mdev = 1.830/1.907/2.034/0.069 ms
Go here
http://www.dnsstuff.com/and here
http://www.dnstools.com/to run tests, then talk to whoever maintains your domain records to get it set up correctly