[otrs] Problem with Postmaster filters (?)

Hi all, I'm not sure if this is a bug or misconfiguration. We're using OTRS 3.1.11 and we noticed that emails are not dispatched to their right Queues using Postmaster filters. We're using IMAPs, Trusted account, Dispatching by select Queue (previously by To: field) and tried the following syntaxes in our filters: *Filter condition (one of the following per test):*

From == @domain From == @domain.* From == .*@domain From == .*@domain.*

*Set Email Header:* X-OTRS-Queue == *Queue_name* Please let me know your thoughts, it's very frustrating and used to work OK on our earlier installation, 3.0.1. Thanks //M