Sorry for the delay in replying - I have been continually testing to try and understand in what area the problem lies. I am using Thunderbird, and all current updates are installed. It's very difficult to define the problem exactly. My computers (two of them with this email account on) are continually rejecting my imap password. At times, emails are being received and sent even when the password is being requested. Of course, I'm using the app-password generated in My Virgin Media, and I have generated at least eight new passwords during the past few weeks in attempt to resolve problem. I can also "ping" imap.virginmedia.com from Command prompt with good results. The baffling thing has been that, although much of the time emails folders are not being updated, they occasionally just spring into action and update without my having done anything. When this happens, the problem is usually resolved until I have to shut down and restart overnight. I am baffled by the volatility and unpredictability of all this, and I'm wondering if there is a problem with my email account at VM's end.
