spool dir buglet

/hosts/ro/usr/spool/exim/db:

  total 18
  drwxr-x---   2 exim     exim         1024 Mar  7 17:43 .
  drwxr-x---   6 exim     exim         1024 Feb 26 16:40 ..
  -rw-r-----   1 exim     exim            0 Mar  7 17:43 reject.dir
  -rw-r-----   1 exim     exim         1024 Mar  8 01:01 reject.pag
  -rw-r-----   1 exim     exim         4096 Mar  7 14:13 retry.dir
  -rw-r-----   1 exim     exim         4096 Mar  8 10:55 retry.pag
  -rw-------   1 exim     exim         4096 Feb 28 11:04 wait-smtp.dir
  -rw-------   1 exim     exim         3072 Mar  8 10:56 wait-smtp.pag

As you see, wait-smtp doesn't have group read. Shouldn't it?