I am running a Windows 2000 network with Active Directory integrated
DNS. I use DNS forwarding and Earthlink handles my DNS records.
Earthlink also handles our web site as well as providing mail service
for us.
We run MS Outlook as our email clients. Up until recently we were
using mail.earthlink.net as our pop3 server. Earthlink upgraded our
email and now we are supposed to use a pop server that corresponds to
our domain name. Example pop.mycompany.com
The problem is that I cannot reach pop.mycompany.com. I have created a
host record in my DNS that maps the correct ip address to
pop.mycompany.com. I can use nslookup to find that address. I cannot
however tracert the address from inside my network. I can tracert the
server from samspade.org and I can get into our pop server using the
Earthlink web mail program.
I have my client side DNS resolvers setup to use the internal DNS
server. I am pretty certain that I have my forwarding setup correctly
considering that I have had no real DNS problems before.
I cannot figure this out and Earthlink is sure it is a problem on our
network.
Thanks
Phillip

Try to use the IP address of pop.mycompany.com on the local client. 
This will bypass DNS and possibly solve the problem.

Dear pg3phillip-ga:

I am posting this as a comment because I have no real way of knowing
what your configuration is. I assume that if it works (and I hope it
does) that you will let me know so I can go ahead and close your
question:

Go to OUTLOOK

Find TOOLS (at the top of the application). Now click on TOOLS. A menu
will drop down.

Find ACCOUNTS and click on it.

If your default email address (username) is not already highlighted,
highlight it.

Now click on the button that says PROPERTIES.

Now click the tab that says SERVERS.

Make sure that the field that says: “My incoming mail server is a ____
server” says POP3 in that field. If it doesn’t, change it so that it
does.

Now, just below that is this field: “Incoming mail (POP3)”. Make sure
this field says POP3.yourdomain.com
If it does not, change it.

Just below that is: Outgoing mail (SMTP). It should say:
mail.yourdomain.com
If it does not, change it.

Make sure your account name and your password are correct. It’s wise
to retype them just in case there is an error. Keep in mind that if
your username and password also changed, you will need to change them
to whatever your new server will recognize as prescribed by your
service. The username is usually the name that your email is being
sent to. For example, if your email address is Bob@yourdomain.com, the
username in this field should be “Bob”. Now retype your password.

Click the button that says APPLY. Now click the button that says OK. 

It would be wise to restart your computer now. When it comes back
online, try your email and see if you get anything. If you don’t, send
an email to yourself, wait a few minutes for the server to process it,
and check for new mail again.

I believe this will work for you. If it does, please let me know.

Regards;
Tutuzdad-ga

cambus-ga
Thanks for the comment but I can't tracert the server using the ip
address. I gave your suggestion a shot but it didn't work

tutuzdad-ga
Thanks for the comment. I have checked and rechecked my Outlook
configuration. I have about 7 folks using Outlook and prior to the
e-mail upgrade we had no trouble. Just to be sure however I checked
the configuration again. Outlook is configured correctly. I think the
problem has more to do with DNS than anything else but I may be wrong.

arimathea-ga
I am unable to open a connection on port 110 to pop.mycompany.com
I don't mean to second guess you but this isn't a firewall issue
because I can telnet to port 110 on mail.earthlink.net with no
problem.
Earthlink support staff have successfully opened a telnet connection
to pop.mycompany.com on port 110 from outside our network.
Thanks for your comment