Using NIS 2011 and Thunderbird 3.1.9 on Windows 7 Home Premium 64-bit, SP1 - all kept fully up to date.
I have a single POP3 mailbox which I access on demand rather than automatically, and everything has been working fine for almost a year. However, over the last week I have 3 times found that an incoming email has just got stuck. Nothing is hanging, and there are no notifications or error messages in Thunderbird, Norton or the Windows event viewer. The progress bar and information (Message x of xx) remain visible as if the download is continuing, but nothing progresses, and pressing Stop has no effect.
I've found that the easiest thing to do is to disable my connection, which then stops the download, then re-enable it and try again, and so far the incoming mail has then downloaded normally. I haven't been able to detect anything different about the email at which it gets stuck - ie it's not big, spam, or with an attachment.
The suggestion on the Thunderbird board is that it's more likely to be the email scanning than Thunderbird that's causing the problem, so does anyone have any ideas, please? For the time being I have disabled incoming email scans, but as the problem seems to be intermittent it may be a while before I can see if this fixes it. However, this has put Norton into a permanent error state - is there any way to tell it to ignore this particular setting?