[Bug 883459]

[Schuschq]

had the same problem,

after migrating a really big mailbox (lots of old mails, mostly small
mails, using 1,9 GB now on drive) from pine some two years ago, i used
another program on opensuse 12.x (the standard one, forgot the name) and
transferred all the mailbox folders to it. After setting up a new linux
box with opensuse 13.1 I finally transferred all the mail to K-Mail -
which all worked without problems. But since introducing new filters in
K-Mail everytime i changed to the incoming mail folder (Posteingang)
now, I had a set of spam mails which always reappeared ... they are then
immediately filtered in a spam folder ... in this folder I had dozens of
duplicates after some weeks. The duplicates all "belonged" to one of the
filters.

here: Opensuse 13.1, K-Mail/KDE 4.11.5

what I did to get rid of this duplicates

- i changed the folder for incoming mail to anotherone (e.g. _incoming)
- i moved all the mails from the incoming folder to _incoming
- quitted K-Mail

- found still mail in 
  /home/schorsch/.local/share/local-mail/inbox/new/
  (all from this spamming shopping-de.cc mailer)

- deleted these mails manually

- opened K-Mail again, switched incoming mail folder back to original folder
- quitted K-Mail, opened it again, moved mail back to original folder
- done

no more duplicates :-) ... perhaps this helps?

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

Title:
  KMail duplicates emails

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