Thunderbird suddenly will not download my mail. Instead, it stops and resets the connection to the POP server and gives me a pop-up message saying: ''Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox.'' I've deleted almost all messages in my Inbox and everything in Trash. I've gone to my webmail and deleted any messages I don't recognize on the server. I turned off my firewall. And I checked my settings, which seem to be fine. All to no avail. Thunderbird still won't download my mail and gives me the same message over and over. What do I do now? Please help!