On 08.08.16 23:26, flapflap wrote: > Ludwig Hügelschäfer: >> On 08.08.16 21:51, Valentin wrote: >>> One of my contacts writes me encrypted mails with (I guess) the Memory Hole >>> feature[2]. >> >>> When I receive a new (encrypted) mail, its subject is "Encrypted >>> message" (like intended). Then I decrypt it and its "real" subject takes >>> place. Since this subject stays there after my key gets locked, I assume >>> the decrypted subject gets cached(?). >>> >>> However, Thunderbird doesn't recognize mails with encrypted subjects to >>> belong together. >> >> It uses the "References" header. If your partners mail doesn't provide >> one, Thunderbird can't sort it in threaded view. The "Subject" header is >> NOT used for constructing the threaded view. >> >> Just look at the message source (CTRL-U on windows and Linux) and search >> for the References header. > > This is a very annoying problem in Thunderbird. (I asked the same thing > a while back) > > Basically in MemoryHole, the message outer header gets one (fresh, > unassociated with previous emails) References field and the inner > message header gets the correct References, matching to the replied to > email. Enigmail with MemoryHole does all correct. > The problem is Thunderbird, which uses the outer References field to > place the email in the tree/hierarchy, then runs the decryption, and > finally, it can read the inner email header. At this stage, it replaces > the subject of the outer header with the correct one from the inner > header. It could also read the References field and rearrange the email > in the tree, but Thunderbird does not. Hence, you cannot use MemoryHole > together with the threaded view :( > > Ideally, someone would fix Thunderbird and delay reading the References > field until the message has been decrypted and the actual References is > known. However, Patrick Brunschwig replied to my email back then, that > this is not a trivial task because the References parsing happens so > early in message processing.
The implementation in the next major version of Enigmail will no longer encrypt the "References" header automatically (you can still enable it in a preference). I know this leaks more data than ultimately desired, but it's still better than nothing. -Patrick
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