Comment 124 for bug 883459

(In reply to Hussam Al-Tayeb from comment #104)
> But this is all just messy. I wonder why no one is investigating this
> thoroughly...
I'm not completely sure if the KMail guys really use KMail themselves :-P

Even if we have two causes for the problem, it's still the right place here as the bug's name is "KMail duplicates filtered messages" – and that's what happens, no matter if it's caused by some Akonadi/Baloo/Whatever black hole or something different.