filter only OK when IMAP folder is INBOX

[Sabih Gerez]

I have the following problem.

On one of the IMAP servers where I receive mail, there is a "junk
e-mail" folder. Let's call this folder (the real server is a Microsoft
Exchange server; maybe this matters):

"{myimap.com/imap/ssl/user=sabih/}Junk E-mail"

I want to filter from there some messages that are
mistakenly qualified as spam.

I have added the specific folder to the "incoming-folders".

The filter rule explicitly refers to the mentioned folder:
.../FLDTYPE=SPEC/FOLDER=...

The rule only works if I specify the mentioned spam folder as my
"inbox-path".

But if inbox-path has another value, the rule does not work. I don't
understand why. I would have expected that the filter does not look at
inbox-path, but only at the folders specified in the rule itself.

Do I do something wrong? Thanks in advance for your reactions.

Sabih