[Enigmail] About Supprting BCCed Recipients

[Patrick Brunschwig]

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Up to now, Enigmail gave a warning if encrypted emails are sent to BCCed
recipients because GnuPG would store the key ID's of all recipients in
the encrypted message. In order to overcome this privacy issue, there is
an option that allows to tell GnuPG not to write some of the key ID's
into an encrypted message ("--no-throw-keyids" and
"--hidden-recipient"). If such "anonymous" key ID's are found in a
message, GnuPG would probe all secret keys until one of them allows to
decrypt the message.

Unfortunately, hiding the keys in a message is an optional part of the
OpenPGP standard; PGP (in particular) is known not to support it.

And here comes my question: please help us out by lettings us know how
many of your correspondents use a tool like PGP such that they would not
be able to decrypt messages with hidden keys by participating in the
poll on our forum:
<http://mozilla-enigmail.org/forum/viewtopic.php?f=3&t=599>

Thanks,
Patrick
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