https://bugs.kde.org/show_bug.cgi?id=338658
--- Comment #72 from Dennis Schridde <devuran...@gmx.net> ---
(In reply to Christoph Feck from comment #71)
> Are there certain steps or specific setups needed to reproduce?
I have no clue how to gather additional information about the issue. I don't
even know what messages or folders cause the error, because there is no error
message.
I will recap my setup and symptoms, though:
Setup:
* Server
- Gentoo Linux
- Dovecot 2.2.27
- dbox mailboxes
- Dovecot Pigeonhole 0.4.16
- Heavy use of Sieve scripts to sort mailing lists and spam
- Dovecot Antispam 2.0_pre20130429
- My spam and ham folders should be monitored and acted upon by this
plugin, but it appears to not do anything at all.
* Client 1
- Gentoo Linux
- KMail 5.4.2
- KDE Apps 16.12.2
- KDE Frameworks 5.31.0
- KDE Plasma 5.9.2
- No client side filtering. I use Sieve exclusively.
- The error appears here.
- I use this client on a daily basis, when I am at home.
* Client 2
- Arch Linux
- KMail 5.4.2
- KDE Apps 16.12.2
- KDE Frameworks 5.31.0
- KDE Plasma 5.9.2
- No client side filtering. I use Sieve exclusively.
- The error does not appear here.
- I use this client only very very seldomly. The machine mostly stays powered
off.
* Client 3
- Roundcube 1.2.3
- No client side filtering. I use Sieve exclusively.
- I use this client on a daily basis, when I am not at home.
* Client 4
- Android 6.0.1 / Cyanogenmod 13
- Whatever the default mail client is there...
- I use this client on a daily basis, throughout the whole day.
The mail account itself consists of a lot of (ca. 200 [1]) nested mailboxes (up
to 4 levels: /1/2/3/4). Some of these are rather large (10 contain >5k mails,
the largest being at 25k [2]).
The following was observed on "Client 1":
* KMail syncs the "sent" folder (7k mails) every time, which takes a few
seconds. All other folders just flash by so quickly I can barely read their
name.
* After the multiple-merge-candidates error appeared, KMail sometimes continues
working (i.e. further clicks on "Check Mail" start a sync), but sometimes this
account will not appear on the sync details list (behind up-arrow at bottom
right of screen) again, until I run "akonadictl restart".
* There is no visible error message (not counting the one displayed in the sync
details list, because it is hidden behind a button, only displayed very briefly
and without an indication that it is an error).
* There is no hint what mail or mailbox is causing this.
* KMail never recovers from this error. I.e. it does not merge the mails
automatically or ask me for help.
[1]: doveadm -f flow fetch -u $USER mailbox-guid all | sort -u | wc -l
[2]: doveadm -f flow fetch -u $USER mailbox-guid all | sort | uniq -c | sort -n
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