If you don't know about rules wizzard it's probably not the problem, but it's
under "tools". You can setup rules for certain emails that come in to
automatically go to a certain sub-folder. I would bet your problem is in
spamkiller. Delete it entirely, reboot, then try again. If that does't work
try creating a new profile. Has mail been working and all of a sudden it
starting thos behavior or did you install spamkiller and then it started or
is this a new installation?
Clayton