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Broken by server upgrade

I've been using POPFile with Netscape Communicator 4.79 for years and years now, because I was never able to get Thunderbird to import my folder structure. Today, my ISP upgraded my account to some new infra, and I can't seem to get POPFile + Netscape to 'talk' to the POP server.

My ISP says the big difference is that the POP user name is now, not jon. I followed the instructions at, and set the Mail Server Properties / User Name to

But! When I press Ctrl+T to get mail, I get a Password Entry Dialog that wants the Password for mail user

Can anyone tell me how to fix this?