Hey, it is hard to descide witch upstream bug matches best: https://bugs.kde.org/show_bug.cgi?id=276856 https://bugs.kde.org/show_bug.cgi?id=288208 https://bugs.kde.org/show_bug.cgi?id=278737 https://bugs.kde.org/show_bug.cgi?id=294074 https://bugs.kde.org/show_bug.cgi?id=285063 I think the underlying problem is a race condition between sync with the sever and kmail. So if you mark a message when akonadi is performing a sync, the read status will be updated first from kmail and the overwritten by akonadi sync -> kmail read status is lost. Molstly this problem is related with very big folders. Regads, sandro
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