First of all, I am not direct Zimbra user; it's my university as the mail provider using it on its server. Still I have a problem I couldn't solve with the admin, so here I am.
The story starts with any mail incoming from my friends in Russia classified as spam. I prefer to read and write with Russian fonts, and it looks like the software can't cope with Cyrillic alphabete in headers or body of the message. Guy said he has no idea what to do about that and advised simply establishing a filter.
So I set up one, with rules defined roughly as here (if the sender address is in my contacts, save in Incoming folder).
Disappointingly, so far it's only partly a success. I mean, despite having checked 'Active' box, it works only when I manually press "run filter". Sure thing I would prefer to have it working constantly, not that I have to manually check the spam every other day - any idea?