Thanks for the replies, I only just saw some of them today.
My email provider, 1&1, on its mail server, had somehow decided recently that about 95% of mail sent to this account was spam (I only use this address for a few linux related things) and so after going into the 1&1 webmail, I managed to mark all the "spam" messages at not spam, and then retrieve them in Thunderbird. None of the messages it marked as spam were spam at all, in fact, I don't think I really get much spam at all on this email address (which is a testament to this mailing list).
David King
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