To follow a person's email correspondence?

From: AO (alanox...)

Hello everybody,

I am in the displeasing siuation where I need to follow a person's
email correspondence for a given period. I've heard about a kind
of a software which can be sent as e.g. a greatings card or so and
which could send reports of the person's emailing activity.

Could anybody throw some light on this issue and where can I
find such a utility?
Thanks in advance.

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