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. ~flapflap
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