So I think I found my new mails...

[Martin Steigerwald]

Hi Ian.

Ian Douglas - 23.03.18, 13:08:
> As previously mentioned / ranted either here or on a bug report, since the
> last update in late January, KMail has been storing my mails "somewhere
> else" rather than in
> /home/ian/.local/share/.local-mail.directory/
> where it did previously.
> 
> Deleted mails are now put in
> /home/ian/.local/share/local-mail/trash/new/
> 
> I think I have finally found where the new mails are, and they're buried in
> a long string of numbered directories by Akonadi.
> 
> See attached.
> 
> Issues:
> 
> 1. This is not a maildir.

This is actually the place where Akonadi stuffes payloads (i.e. mails, events, 
contacts) that are too large to stuff into the database. There is a threshold 
there. Why does Akonadi store them? It is a cache – for various reasons. But… 
and that is the thing: The resource puts those payloads into the final 
destination, i.e. the maildir. However: If this, for some reason, does not 
work, it never tries again to do so. And these are items without RID, without 
remote identifier.

When you use akonadictl fsck it should tell.

Please, really please, before I explain it all here again and probably using 
an hour or more for that, read through the architecture document by Dan.

https://community.kde.org/KDE_PIM/Akonadi/Architecture

Especially the section about change replay.

Server-side change recording is one of the four major changes to the low level 
architecture that will fix that. Unfortunately it is not yet (completely 
implemented). I personally think that this is one of the most important 
changes as the current situation can lead to data loss if for some reason the 
Akonadi database (including the filedb part of it) becomes broken.

So for now all you can probably do is make sure you keep your Akonadi database 
safe and not delete it or so, until it Akonadi is able to replay the changes 
again.

What puzzles me tough is: Why on earth could Akonadi not write back the mails 
to the maildir? I have also some items without RID, and I don´t know why it 
could not have been able to stuff those mails into the maildir. I understand 
this with an IMAP account + broken network connection, but not with local 
mail. Unless you had a filesystem full condition or so.

[…]
-- 
Martin