About 80% of the time, T-Bird won't retrieve new e-mails - can't locate pop server
When I click on the Thunderbird icon to retrieve new e-mails, about 80% of the time it says it is looking for the pop-server, and then that it can't locate the server. When I just log on to my e-mail provider's website (webmail.nycap.rr.com) and enter my e-mail address and password, I immediately get connected and get my e-mail. This suggests that the problem is with Thunderbird, not Time-Warner. The problem has just begun recently and has gotten much worse with every passing day.
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Are the 20% where it's working when you access your mail via browser?
Webmail is completely different to accessing mail via a mail client.
Check this article. https://support.mozilla.org/en-US/kb/problems-sending-and-receiving-messages
No. It works 100% of the time when I access e-mail via browser. When I try to access e-mail by clicking on the Thunderbird icon it only works about 20% of the time.
Your issue is more than likely defective DNS resolution. The error "unable to find" is a DNS error.
Note DNS is an operating system thing and can be very adversely affected by some security software than tries to monitor DNS lookups.
Historically Road Runners DNS servers have had a very spotty reputation as a Google search of "road runner DNS" will attest. Perhaps you need to use the Google DNS servers instead. More than likely Road runner are experimenting with IPV6 again and their resolution service has gone nuts again.
You will note that Thunderbird connects to a very different road runner server than the web server used to display webmail.