[Bug 208581] New: introduce "unsure" folder for spam filtering

[S. Burmeister]

https://bugs.kde.org/show_bug.cgi?id=208581

           Summary: introduce "unsure" folder for spam filtering
           Product: kmail
           Version: unspecified
          Platform: SuSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: sven.burmeister at gmx.net


Version:            (using KDE 4.3.1)
OS:                Linux
Installed from:    SuSE RPMs

An explanation can be read in the kdepim archives:
http://lists.kde.org/?l=kde-pim&m=124195221523397&w=2

Basically this is about kmail doing the wrong thing when the spam filter tool
is not sure whether a message is spam or ham.

There are two things that mus tnot happen:
1. If unsure, do not mark a message as spam or ham.
2. If unsure do not do nothing.

2. is very important to get spam tools going, i.e. to train them, especially
the light-weight ones that do not slow down kmail. If kmail does not do
anything but keep them in the inbox, the user won't act on ham, because there
is no need to mark anything as ham that is already in the correct folder, i.e.
the inbox.

Since the user does not mark any emails as ham, the spam filtering tool cannot
learn what is regarded as ham and thus not decide what should be marked as
spam.

If kmail would stick to the spam filtering tool's definition, i.e. move emails
that it is not sure about to an unsure folder, the user would act upn those
emails and mark them as either spam or ham thus training the spam filtering
tool.

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