[Bug 158756] New: spam-filter wizard does not use "not in addressbook" feature by default

[S.Burmeister]

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http://bugs.kde.org/show_bug.cgi?id=158756         
           Summary: spam-filter wizard does not use "not in addressbook"
                    feature by default
           Product: kmail
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs kde org
        ReportedBy: sven.burmeister gmx net


Version:            (using Devel)
Installed from:    Compiled sources
OS:                Linux

If I use the spam-wizard to set-up spam-filtering via bogofilter, the "check-rule" only includes "email not larger than x". Since kmail provides a whitelist-feature, i.e. "not in addressbook", this should be added as criterion.

If this is not enabled by default because checking against every single contact in all addressbooks is too slow, I would suggest the following, if it is doable with akonadi. There has to be some possibility, since thnderbird can do this as well.

If one would create a sub-list of just the domains that are in the local addressbook, this would increase performance by quite a bit, since only those emails that have a matching domain have to be checked against all contacts in the addressbook.

An example:
Suppose I would work at kde.org, i.e. I have a lot  kde org addresses in my addressbook. So if 5% of my the spam-emails  I get use  kde org, only those 5% have to be checked against all contacts with  kde org in my addressbook. Those 95% with other domains, which do not have a domain that is part of my addressbook do not cause any query-traffic.

Another, quicker approach would be to include a checkbox in the wizard that asks the user whether to use the addressbook as whitelist or not.