[Dovecot] mixing virtual and system users

[Julien Beauviala]

Hello all,

I'm setting up a small mail server for aprox 20 users, and I'm trying to
keep it really simple so I went the virtual users as text file way,
following this page :

http://lukas-schulze.de/2012/02/setup-postfix-and-dovecot-on-debian-squeeze-with-users-stored-text-file/

It seemed to work fine except for the 'system' users, and I am stumped
by this. Basically the config does not 'see' /etc/aliases, so mail to
root or mailman are 'Recipient address rejected: User unknown'.

I've added the backup pam as explained by the following page* and tried
many permutations in /etc/postfix/main.cf but still not good, systems
users are rejected. Obviously something is amiss.

* http://wiki2.dovecot.org/Authentication/MultipleDatabases

If someone could point me in the right direction, that would be great.

The system is debian 6, details of the configuration below.

dovecot -n :
------------
# 1.2.15: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-5-amd64 x86_64 Debian 6.0.7 ext3
log_timestamp: %Y-%m-%d %H:%M:%S
protocols: imap imaps pop3 pop3s
ssl_cert_file: /etc/ssl/certs/postfix.pem
ssl_key_file: /etc/ssl/private/postfix.key
login_dir: /var/run/dovecot/login
login_executable(default): /usr/lib/dovecot/imap-login
login_executable(imap): /usr/lib/dovecot/imap-login
login_executable(pop3): /usr/lib/dovecot/pop3-login
first_valid_uid: 5000
last_valid_uid: 5000
first_valid_gid: 5000
last_valid_gid: 5000
mail_privileged_group: vmail
mail_location: maildir:/var/vmail/%d/%n/Maildir
mbox_write_locks: fcntl dotlock
mail_executable(default): /usr/lib/dovecot/imap
mail_executable(imap): /usr/lib/dovecot/imap
mail_executable(pop3): /usr/lib/dovecot/pop3
mail_plugin_dir(default): /usr/lib/dovecot/modules/imap
mail_plugin_dir(imap): /usr/lib/dovecot/modules/imap
mail_plugin_dir(pop3): /usr/lib/dovecot/modules/pop3
lda:
  auth_socket_path: /var/run/dovecot/auth-master
  postmaster_address: postmaster at example.net
  mail_plugins: sieve
  log_path:
auth default:
  mechanisms: plain login
  verbose: yes
  passdb:
    driver: pam
  passdb:
    driver: passwd-file
    args: scheme=CRAM-MD5 /etc/dovecot/users.conf
  userdb:
    driver: static
    args: uid=5000 gid=5000 home=/var/vmail/%d/%n allow_all_users=yes
  userdb:
    driver: passwd
  socket:
    type: listen
    client:
      path: /var/spool/postfix/private/auth
      mode: 432
      user: postfix
      group: postfix
    master:
      path: /var/run/dovecot/auth-master
      mode: 384
      user: vmail
      group: vmail


postconf -n :
-------------
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
broken_sasl_auth_clients = yes
config_directory = /etc/postfix
debug_peer_level = 2
inet_interfaces = all
mailbox_size_limit = 0
mydestination = localhost
mydomain = example.net
myhostname = osiris.example.net
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
myorigin = $mydomain
queue_directory = /var/spool/postfix
recipient_delimiter = +
relayhost =
show_user_unknown_table_name = no
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtp_tls_note_starttls_offer = yes
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtp_use_tls = yes
smtpd_banner = $myhostname ESMTP $mail_name
smtpd_helo_required = yes
smtpd_helo_restrictions = reject_invalid_helo_hostname
smtpd_recipient_restrictions = reject_unknown_recipient_domain,
reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated,
reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_path = private/auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_tls_security_options = $smtpd_sasl_security_options
smtpd_sasl_type = dovecot
smtpd_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtpd_tls_cert_file = /etc/ssl/certs/postfix.pem
smtpd_tls_key_file = /etc/ssl/private/postfix.key
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_tls_session_cache_timeout = 3600s
smtpd_use_tls = yes
tls_random_source = dev:/dev/urandom
virtual_alias_maps = hash:/etc/postfix/virtual_alias_maps
virtual_gid_maps = static:5000
virtual_mailbox_base = /var/vmail
virtual_mailbox_domains = hash:/etc/postfix/virtual_mailbox_domains
virtual_mailbox_maps = hash:/etc/postfix/virtual_mailbox_maps
virtual_minimum_uid = 100
virtual_transport = dovecot
virtual_uid_maps = static:5000

/etc/postfix/virtual_mailbox_domains :
--------------------------------------
@example.net OK
@osiris.example.net OK

/etc/postfix/virtual_mailbox_maps :
-----------------------------------
elisabethp at example.net          example.net/elisabethp

/etc/postfix/virtual_alias_maps :
---------------------------------
elisabeth at example.net           elisabethp at example.net


j.