I still get duplicated messages with KDE 4.9.3 when downloading mails from a pop3 account which then get directly moved to a subfolder via a filter. Both the original and the duplicate message are displayed in the destiantion folder of the filter and you can "remove" the duplicate by right click on the folder and choosing "refresh folder".
I still get duplicated messages with KDE 4.9.3 when downloading mails from a pop3 account which then get directly moved to a subfolder via a filter. Both the original and the duplicate message are displayed in the destiantion folder of the filter and you can "remove" the duplicate by right click on the folder and choosing "refresh folder".