I am using Thunderbird on Windows 7 to fetch emails from my ubuntu server.
I found my mails being stored in /var/qmail/mailnames/domain.de/info/Maildir/cur but neither in /var/qmail/mailnames/domain.de/info/Maildir/cur nor in /var/qmail/mailnames/domain.de/info/Maildir there is a Junk folder or Spam folder.
My goal is to use sa-learn with the junk folder to learn.