[Exim] pb with starting up exim

when i start up exim, here is the log:



quark# /usr/exim/bin/exim -bd -d -v
Exim version 4.05 uid=0 gid=0 pid=1472 L=834cd8 D=fff7577f
probably Berkeley DB version 1.8x (native mode)
changed uid/gid: forcing real = effective
uid=0 gid=0
auxiliary group list: 0
trusted user
admin user
originator: uid=0 gid=0 login=root name=Charlie Root
listening on all interfaces (IPv4) port 25
pid written to /var/spool/exim/exim-daemon.pid
changed uid/gid: running the daemon
uid=26 gid=6
auxiliary group list: 6
LOG: MAIN
exim 4.05 daemon started: pid=1472, no queue runs, listening for SMTP on
port 25 (IPv4)
LOG: PANIC DIE
Cannot open main log file "/var/spool/exim/log/mainlog": Permission
denied: euid=26 egid=6
2002-07-19 19:08:25 Cannot open main log file
"/var/spool/exim/log/mainlog": Permission denied: euid=26 egid=6
exim: could not open panic log - aborting: original error above
search_tidyup called
>>>>>>>>>>>>>>>>>> Exim pid=1472 terminating with rc=1 >>>>>>>>>>>>>>>>>>

cat /etc/group
mail:*:6:
mailnull:*:26:

cat /etc/passwd
mailnull:*:26:26:Sendmail Default User:/var/spool/mqueue:/sbin/nologin


ls -la /var/spool/exim/log

drwx------  2 mailnull  mail  512 Jul 19 06:37 .
drwxr-x---  3 exim      exim  512 Jul 19 03:02 ..
-rwx------  1 mailnull  mail    0 Jul 19 06:37 mainlog

i didnt understand


thanks