[Pkg-exim4-users] maildirsize not being created with correct permissions

[Eduardo M KALINOWSKI]

I have this transport set:

virtual_user_maildir:
  debug_print = "T: virtual_user_maildir for $local_part@$domain"
  driver = appendfile
  directory = /home/vmail/$domain/$local_part/INBOX
  create_directory
  delivery_date_add
  envelope_to_add
  return_path_add
  maildir_format
  directory_mode = 0750
  mode = 0640
  mode_fail_narrower = false
  user = vmail
  group = mail
# Store quota information
  maildir_use_size_file = true
  maildir_quota_directory_regex = ^(?:cur|new|\.(?!Trash|Spam).*)$
# Store message sizes in filename
  maildir_tag = ,S=$message_size
  quota_size_regex = ,S=(\d+)
# Use maildirfolder files
  maildirfolder_create_regex = /\.[^/]+/?$

(which is a relatively small change to the default Debian transport for
maildirs)

The messages and folders are correctly created with the specified modes,
but the maildirsize file is created with mode 600 (user and group are
OK, though). I'd like it to have group read permission to ease backups,
but exim does not seem to be creating the file with the requested mode.
Exim version is 4.68-2~bpo40+1. Any suggestions?

-- 
Extreme fear can neither fight nor fly.
		-- William Shakespeare, "The Rape of Lucrece"

Eduardo M KALINOWSKI
eduardo at kalinowski.com.br
http://move.to/hpkb