[Exim] failed to open database lock file errors

While running eximon, I noticed I had a whole of errors that said:

failed to open database lock file /var/spool/exim/db/retry.lockfile:
Permission denied (euid=8 egid=8)


Doing an ls -l of the /var/spool/exim/db directory, I see:

-rw-r-----    1 root     root         4096 Apr 19 06:25 retry
-rw-r-----    1 root     root            0 Apr 19 06:25 retry.lockfile
-rw-r-----    1 mail     mail        16384 Apr 24 12:17 wait-remote_smtp
-rw-r-----    1 mail     mail            0 Apr 22 12:01 wait-remote_smtp.lockfile

Are the retry* files supposed to be owned by root/root, or should they
be mail/mail? Is that where the problem lies? I know I never chown'd
any of these files manually. Anyone know what could have happened?

Thanks,
Nelson