truncated e mails in thunderbird Results

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To save disc space, I have set TBird to not download emails over 150 KBytes.

On large files, I get the message:

"Truncated!This message exceeded the Maximum Message Size set in Account Settings, so we have only downloaded the first few lines from the mail server.

Click here to download the rest of the message."

Yet when I click on the message, nothing happens!
Any suggestions?