how vulnerable is "hidden-encrypt-to"

auto15963931 auto15963931 at
Fri Aug 17 16:56:56 CEST 2012

Is there any way on heaven or earth for someone to discover from a
message, one sent to them or to another person, whether the encrypted
message had been made with an option "hidden-encrypt-to" or what key ID
had been used in conjunction with that option? Thanks.

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