[Dovecot] dspam plugin

[Goran Mekić]

	When I drag n drop spam mail to SPAM folder, I get this error:
Jun 11 17:58:46 sparrow dspam[28452]: Unable to open file for
reading: /var/spool/dspam/data/local/mymail/mymail.sig/466d652f315451306914567.sig:
No such file or directory

mymail is user that runs dovecot transport (postfix config). The .sig
file exist
in /var/spool/dspam/data/<domain>/<user>/<user>.sig/466d652f315451306914567.sig.
I've tried to google this problem, but no luck. Any advices? Thanx!