Beware of Thunderbird 78 attaching keys

[team at schleuder.org]

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This is a warning about Thunderbird version 78 and later versions:

Please be aware that since version 78, Thunderbird by default attaches
your public key to every outgoing, signed email. With normal emails this
is not a problem. With emails to a schleuder-list that contain X-RESEND
it’s different though: it reveals the public key of the actual sender,
which probably leaks information about your email address and maybe name
to the recipients.

To prevent that, please de-select Attach My Public Key from the
Options-menu in each X-RESEND email.

As of now there is no option to generally disable attaching your key. It
has already been wished for [1], though.


[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1654950
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