[tor-bugs] #6392 [TorBirdy]: prevent leak of msg-id of original mail when forwarding a mail

[Tor Bug Tracker & Wiki]

#6392: prevent leak of msg-id of original mail when forwarding a mail
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 Reporter:  tagnaq    |          Owner:  ioerror
     Type:  defect    |         Status:  new    
 Priority:  normal    |      Milestone:         
Component:  TorBirdy  |        Version:         
 Keywords:            |         Parent:         
   Points:            |   Actualpoints:         
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 When forwarding an email the mail header contains the msg-id of the
 original received email, this might be a problem to the forwarding person.

 We should remove the following header fields in forwarded mails:

 {{{
 References:
 In-Reply-To:
 X-Forwarded-Message-Id:
 }}}

 There are two scenarios where this can happen:
 - user hits the Forward button
 - user hits the Reply button and replaces the recipients

 btw: also the body contains parts of the original mail header (when
 hitting the Forward button) but this can easily be seen by the forwarding
 person and easily be modified/removed (we do not modify the body).

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6392>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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