I have exactly the same THUNDERBIRD issue, same error messages. Worked fine until last week.. Tried all suggested TPG settings, called TPG technical Support twice, last call said an email expert would call me back. TPG Post Office works fine, as well as Outlook. Call back was supposed to be Thursday, now Saturday. Luckily I have the old outlook, but it cannot import the emails from Thunderbird. Any suggestions? Outlook and mobile phone work with exactly the same settings as Thunderbird, so why Thunderbird cannot receive or send thru same? How about some service TPG!!!!!   ... View more