My inference is that this is a new setup on the PC that has yet to work the first time. And Spectrum is your email provider, yet Spectrum doesn't know the proper server for you? I don't know Spectrum, but if you post complete text of error message and screenshots of your incoming and outgoing server settings panes, someone here may have suggestions. thank you

Thanks David for the reply. This is not a new PC. Been running Thunderbird (Beta) for years. I have found that the last update check worked on 1-6-26 but still can't pin down what happened to make Thunderbird stop connecting for updates. Whatever stopped the updates is also stopping the send/receive. All send/receive settings have not changed so I am now zeroing in on spectrum doing blocking, NoScript & Ublock and SandboxiePlus and OpenDNS.

If you have any ideas please let me know. Thanks.

Puzzling. If the laptop and PC are set up identically, they both should either work or both should fail. I suggest a careful review of settings on the two machines.

I talked to customer service at Spectrum and they verified there was never a block put on my account because of the high number of try's to log in. They say everything is working on their end.

The had me log in with my laptop which works with the email. They came back and said to check my PC login settings for the email pop-server connections.

Turns out the connection security setting and the authentication method had changed. Now email works fine both ways. I had changed these settings many times while testing and nothing worked. Here's the kicker, Thunderbird update now works also as it would not work all the time email was down.

Thanks for your help.