Navigating within the Maildir

I found the pointer in Virtualmin Email management to

/home/domain/homes/user/Maildir/Maildir/

and, in there, I know that there's a .spam/cur

But where is the folder which SquirrelMail calls Junk E-mail?

I see that all of the files(messages) are permissioned 600, and it seems that I am unable to locate a couple of directories.

I am trying to locate the Junk E-Mail folder so that I can run sa-learn.

Thanks, K