[Dovecot] Problem: delivery with mode 600 into shared folder

[seriv at parkheights.dyndns.org]

Hi,
I have a problem, delivery called from /etc/aliases file by pipe delivers with mode 0600. 
I need system users with shared mail folders (Maildir format). 
When I changed alias to pipe to shell wrapper with mode 002 set in it, nothing changed.
MTA is sendmail, OS Solaris, and dovecot version 1.1.1. Can somebody help?


Here are dovecot settings:
---
/opt/dovecot11/sbin/dovecot -n
# 1.1.1: /opt/dovecot11/etc/dovecot.conf
base_dir: /var/run/dovecot/
log_path: /var/log/dovecot.log
login_dir: /var/run/dovecot//login
login_executable: /opt/dovecot11/libexec/amd64/dovecot/imap-login
max_mail_processes: 128
mail_location: maildir:/home/vmail/listuser/Maildir:CONTROL=/home/vmail/%u/Maildir/control:INDEX=/home/vmail/%u/Maildir/index
mail_debug: yes
auth default:
  verbose: yes
  debug: yes
  debug_passwords: yes
  passdb:
    driver: pam
    args: imap
  userdb:
    driver: passwd
  socket:
    type: listen
    master:
      path: /var/run/dovecot/auth-master
      mode: 432
      user: daemon
      group: other
plugin:
  sieve: /opt/dovecot11/sieve-scripts/folders.sieve
---
And this is the alias to pipe:
---
grep deliver /etc/aliases
listuser at domain.com:      "|/opt/dovecot11/libexec/dovecot/deliver -d listuser"
-- 
  Sergey Ivanov.