[Bug 280125] New: Spamassassin rescans all mails in imap inboxes at each kmail startup

[Ralph Moenchmeyer]

https://bugs.kde.org/show_bug.cgi?id=280125

           Summary: Spamassassin rescans all mails in imap inboxes at each
                    kmail startup
           Product: kmail2
           Version: 4.7
          Platform: openSUSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: filtering
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: rm at anracon.de


Version:           4.7 (using KDE 4.7.0) 
OS:                Linux

I use KDE 4.7 with Kmail 4.7. Today I activated spamassassin 3.x (Perl) as a
spamfilter via Kmails spam assistant.

I know that spamassassin in the Perl version is a relatively slow filter, but
it worked very well for the old Kmail 1.x versions.  

However, now it seems that despite appropriate filter settings spamassassin 
checks all the mails in the imap folder for incoming mails again after each
restart of kmail or even after changes to the filter settings. And this, of
course, blocks the use of Kmail for quite a while in case there are many mails
in the imap inbox folder. 

In my opinion - after an initial first run - spamassassin should only check new
incoming mails. This, however, is not the case. From the progress information
one can clearly see that all (!) the mails in the imap inbox folder are checked
again immediately after each start of kmail.     

In contrast to spamassassin there is no such behavior for bogo-filter.

Reproducible: Always

Steps to Reproduce:
Start kmail with an online imap inbox folder with many mails and spamassassin
(PERL version) activated. 

Actual Results:  
Spamassassin investigates all mails in the inbox folder after a kmail start or
a filter change. 

Expected Results:  
The spamassassin filter should only check new incoming mails.

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