Did you know that thing about Domino server rules?

I am struggling with a mail forwarding loop which I can’t resolve (if accidently somebody knows how to fix this in Lotus Foundations – any help welcome – I suspect it’s postfix) I stumbled over the Domino server mail rules (I am excused for not knowing them, because I am a dev … was at least … still bits left, but my shrink says it’s fading away and I should be able to recover completely. Don’t need the green dried frog pills anymore soon). Hey, I thought, what a good idea. I knew about the forwarding address in the person document, but the mail rules were knew to me.
And as always, when the boy get’s a new toy, let’s play around with it.
Of I went for my first rule. If a mail arrives with a certain subject – „test“ – move it to a certain mail box.
Open the console on the mac, „set rules“ and send an email from outside to the domino, open the mail box and … nothing. Ahem? Were is that thing? Not in the destination box either. A quick look in the log: “ … was successfully delivered …“. What? Oh, open the all documents view and YESSSS, there it was. But stop. Why is it marked as a sent mail? That does not make sense at all.
There is probably a very logical and easy to understand reason for this but I don’t care. If it works like that, you can forget it. It’s useless. I would have understood if it was not put in the inbox, but as a sent mail, that does not make sense at all. Really, what were they thinking.