Maildrop - Filtering through mkdir??

Ahoj vseci,
uspesne jsem rozchodil maildrop pres mysql, vsechno slape, jen nemuzu pochopit proc mi nefunguje logovani chyb v maildropu kdyz jsem v /etc/maildroprc dal cestu k logfile. Maillog mi hlasi tuhletu chybu:

Feb 12 12:47:37 localhost maildrop[4098]: Unable to open include file.
Feb 12 12:47:37 localhost postfix/pipe[4097]: 626BA2A8AF9: to=[x97@domena.cz], relay=maildrop, delay=0.15,
delays=0.1/0.01/0/0.04, dsn=4.3.0,
status=deferred (temporary failure. 
Command output: maildrop: Filtering through `mkdir /home/virtual/$HOST` mkdir: cannot create 
directory `/home/virtual/': File exists /usr/bin/maildrop: Unable to open include file. )

Nemuzu pochopit proc to vytvari nejaky adresar kdyz jsem to ani v nastaveni nezadaval.

Dotaz: Maildrop - Filtering through mkdir??