I connot enforce seamonkey the junk mail to be moved to junk dir

[Marek]

Although fixing suitable option in preferences my junked mail do not migrate automatically to the "junk" folder (I have such folder). My SeaMonkey 1.1.15 does nothing but designing that the mail is junked.

ProblemType: Bug
Architecture: i386
Date: Sun Jul 19 13:39:17 2009
DistroRelease: Ubuntu 8.04
NonfreeKernelModules: ath_hal
Package: seamonkey 1.1.15+nobinonly-0ubuntu0.8.04.2
PackageArchitecture: all
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/opt/real/RealPlayer
 LANG=pl_PL.UTF-8
 SHELL=/bin/bash
SourcePackage: seamonkey
Uname: Linux 2.6.24-24-generic i686