Email security: What does “message opened by mailclient” mean?

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Email security
Security
I've recently read that a Belgium MP claimed that her email headers were being read during routing. It also said that the headers had this message "message opened by mailclient". What does this message actually mean?
ASKED: December 6, 2013  8:05 PM
UPDATED: December 6, 2013  8:45 PM

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  • TomLiotta

    That's only part of the message header. It's a header added by the web-mail client that logs the version of the client in the headers. Today the full header is:

    message opened by mailclient 6.73.3.0 (6.73.1.0)

    Tom

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