When I asked,
Has anyone yet seen what kinds of HTML are stuck into mail by
didtheyreadit.com?
Lars answered,
They're using a web bug.
That's what I thought, since their own web site (a) brags that it will
also report when a forwarded message is opened by the party to whom it
is forwarded and (b) admits that it won't know when someone reads the
message as flat plain text without rendering the HTML.
Thanks for the answer, and for the sample.
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