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I have the same issue with frontier email in Portland OR FIOS and have had for 3 days now. I can see them on my iPad and Droid but cannot download them on my PC. I called Frontier, who passed the buck on to Mozilla Thunderbird. There appears to be a single unseen message with everything else piling up behind it.
I'm getting the exact same Error Message. It started yesterday PM and only effects 1 of 3 Frontier email accounts I have. It is a Frontier server problem.
It occurs on both pop3.frontier.com & imap.frontier.com servers.
It occurs on both my Mac & PCs running Thunderbird, but not my iPad running Mail (iOS 6).
I can get all my email accounts using any browser (Mac or PC) accessing Frontier/Yahoo mail.
Something changed with the Frontier Server yesterday!