Problem with spam + mail accounts

[werbemaxe]

Hi there,

I have a cloud server with plesk 11.0.9. and I have activated Spam Assassin server-wide (with no individual domain settings).

With one domain I have 4 different e-mail accounts. At one account (the main account "info") I find my spam mails in the spam folder of Horde, all is fine. In the other 3 accounts, however, NO spam is filtered and all spam mails are delivered to my smartertrack account. I don't know why one account filters my spam and the others don't. I have already set the spam-assassin settings to 5.0, but with no success.

What am I doing wrong? There are not a hell of different settings, so it's strange...

thanks, max