[Bug 883459]

[Linuxfan-2]

Version KMail 5.13.3 (19.12.3)
OS  Gentoo Linux

I have been plagued by this bug for a very long time. Today I found out,
that for ages there has been an error message in my mysql/mariadb log-
file:

[ERROR] Incorrect definition of table mysql.event: expected column
'sql_mode' at position 14 to have type set ...

This is the first time I saw this error, as there is no other
application than akonadi using mariadb on my pc and akonadi was never
complaining. This mariadb-error could be fixed by running mysql_upgrade
(google it to find an explanation, this is due to an incomplete upgrade
of the mariadb-package)

After fixing the database, kmail has not been showing duplicated mails
any longer. Also filters have been working flawlessly.

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https://bugs.launchpad.net/bugs/883459

Title:
  KMail duplicates emails

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