Getting rawlogging working with dovecot 2.2

[Marc Roos]

According to this manual[1] I just have to add these lines to my config, 
not?

protocol imap {
  rawlog_dir = /tmp/rawlog/%u
}

I should be seeing something in this /tmp/rawlog if I delete an message 
via imap not? I have already made this folder 777 and /tmp/rawlog/test 
777, but still nothing is there. The normal syslog of dovecot does not 
report any errors.

[1]
https://wiki2.dovecot.org/Debugging/Rawlog