[Exim] mails keep in queue

Hi,


i have several emails in my Mail Queue and every time i try to deliver
them, i always end up with getting this error message:



Message xyz is not frozen
delivering message xyz
LOG: 0 MAIN PANIC
virtual_user director: /home/zyx/etc/passwd (lsearch lookup): file
mode 2660 should not contain 0020 (check the modemask option)
LOG: 0 MAIN
== name@??? D=virtual_user defer (-18): /home/zyx/etc/passwd
(lsearch lookup): file mode 2660 should not contain 0020



Any idea, what i could do to get the messages delivered?
The only changes within the last days i have done at that account, is
changing the group of the whole account, may this be the cause of the
problem?

Thanks,

Duncan