Version details: 2.3.5
Distribution/Version: SuSE 9.3

1. Goto edit and select message filters. In the pop-up window, click on add.
2. In the 'If' part, from the first drop-down menu, select the option as 'Junk
Test' and from the second drop-down menu, select 'Message is Not Junk'
3. In the 'then' part, choose the 'Mailbox' as the 'Move to folder' destination.
Click on OK.
4. Now goto the Junk Mail folder. Select some mails from the junk mail folder
and apply the filter.
Some of the mails will be moved to the Mailbox.
5. Now goto the Mailbox folder. Select the messages which were moved to that
folder after applying the filter and select 'mark as junk'
The messages will not be moved to the Junk mail folder.

Expected results:
The messages should be moved to the junk mail folder