Problem with Cyrus and blank space in mailbox folder

[Martin Urban]

Hi,

I have a Problem with cyrus and procmail. I use procmail, to check the 
mails and sort them into the right folders. In the procmail recipes (rc) 
I call cyrus to deliver the mails, this works fine so far. But if the 
Folder has a blank space inside its name, it doenstn't work. If I take a 
look into the logs I know whats the problem

    procmail: Assigning "BLA=/usr/cyrus/bin/deliver -a 
username at domain.xx -m user/username/b la at domain.xx

but i didn't find a way to mask this blank space. I tried backspace, 
double backspace, etc but nothing works. Has anyone an idea?

Bye,
Martin