Re: [Hampshire] [OT] Disturbing Gmail observation.

On 10/04/2008, Victor Churchill <victorchurchill@???> wrote:
> No further info yet on this. My colleague is still off on his trip to
> Spain so I have not been able to check the contents/addressees of his
> original mail.
>
> I did try creating a honeypot message Bcc'ed to a Gmail address but
> the sidebar-link phenomenon did not show up on that trial.
>
> Will update if/when I have more to report.

<speculation>
Information could leak in this way if gmail cached ad targeting data
based on the ID of the email. If one or more of the Bcced: recipients,
or the original sender (both of whom are party to the secret
information) reads on the email first, causing the targeting data to
be cached. When the other recipients of the email read the email,
they'd get the cached version.

For most messages this would not be obvious because the recipient
addresses probably aren't interesting targeting data.
</speculation>

Regards,
Graham