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On firefox 13.0.1 running on Mint Linux It is not on the machine from which I send that request.

On firefox 13.0.1 running on Mint Linux It is not on the machine from which I send that request.

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I take it that you are using webmail? It would be something that the webmail client is doing.

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How could I check if it comes from the webmail (hotmail) or the browser (firefox)?

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