Kmail not syncing read/unread state with imap mailbox

[Francesco]

In data domenica 28 aprile 2019 11:23:50 CEST, Francesco ha scritto:
> If those have been already opened by other clients, the
> read state isn't synced up properly.

... not even if clicking on Messages > Update folder (F5) or File > 
Check new mails (CTRL+L).

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F