Ummm... But this setting (pop-server.san.rr.com) is what it's always been, is
also same as the other account thst IS working, and it is what RR tech says
it should be.

Dear Bruce:
Here’s what happened when I set up a new account in the new identity:
Immediately, there were 2 auto-generated messages in the inbox. I switched
identities to the main/ff account to send a test email to the new mlc
identity/account. When I switched back to the new mlc identity/account, it
started to download the 21(or so) emails in the webmail inbox – ONE came
through right away. Then, OE hung-up and would not download the rest; I got
the same pop-up box (no response from server in 60 seconds; do you want to
wait another 60 seconds?). I clicked WAIT several times, but no further
emails came through, so I stopped the download and then got the same error
message (A time-out occurred while communicating with the server. Account:
'm-lc', Server: 'pop-server.san.rr.com', Protocol: POP3, Port: 110,
Secure(SSL): No, Error Number: 0x800CCC19)
I then composed another test message from the new mlc account to the main/ff
account. When I clicked SEND/RECEIVE, the email went out immediately and,
after hanging up the same way, the same ONE email was downloaded again to the
inbox. The test email from the new mlc identity/account came through to the
main/ff account fine. When I checked the RRWebmail account, both test emails
sent to the new mlc identity/account (one from each of the OE
account/identities) were there.

I found TWO (one for each of the accounts?) of the pop3uidl files.
Both are in Application Data\Identities\”#”\Microsoft\Outlook Express.
The “#” of main identity is: {9A883940-96A7-11D3-8CA8-84681C27E32B} it is
201KB.
The “#” of the new identity is {DAABCA51-0A17-11DD-8CA8-001CF08B29A1} and is
74KB.
BUT, I didn’t delete them because I wasn’t quite sure – I don’t want to lose
the emails, are they all stored there? Will they go away if I delete the file?
Tomorrow morning, I will try creating a new account in safe mode.
Again, thank you for your assistance.
m-lc

I wasn't getting sidetracked with e-mail scanning. It is the most likely
cause of a time-out error.

According to this, RR doesn't provide any anti-virus program:
http://www.nycap.rr.com/techtips/index.php?ID=11

Not having one is like skydiving without a parachute.

I use Avast, (freeware). Choose Custom Installation and under Resident
Protection, uncheck: Internet Mail and Outlook/Exchange.

Avast:
http://www.avast.com/eng/download-avast-home.html

Now, back to your current problem.

Do both addresses use the same identity? If so, remove the problem account
and add it back via File | Identities | Add New Identity. You will have to
switch identities to go from one to the other, but this may answer some
issues. If it works this way, we can try to get it working in the same
identity. (Another process of elimination).

It may also be a corrupt pop3uidl.dbx file.

Tools | Accounts | Mail | Properties | Advanced. Uncheck: Leave a copy of
messages on the server. Then delete the Pop3uidl.dbx file.

Tools | Options | Maintenance | Store Folder will reveal the location of
your Outlook Express files. Write the location down and navigate to it in
Windows Explorer or, copy and paste it into Start | Run.

In WinXP, Win2K & Win2K3, the OE user files (DBX and WAB) are by default
marked as hidden. To view these files in Windows Explorer, you must enable
Show Hidden Files and Folders under Start | Control Panel | Folder Options
Icon | View, or in Windows Explorer | Tools | Folder Options | View.

With OE closed, find the DBX file for the folder in question {Pop3uidl.dbx}
and delete it.  A new one will be created automatically when you open OE.

If still no joy, have a look at some other possibilities here.

How to troubleshoot error messages that you receive when try to send and
receive e-mail in Outlook and in Outlook Express:
http://support.microsoft.com/default.aspx?scid=kb;en-us;813514&Product=oex