dovecot - Oct 2014 - Multiple user attributes in LDAP userdb query strings

Hello list, I have an issue with dovecot and Ldap... Any help will be
grateful...
 
I have my virtual users stored in an Active Directory database. I am
using 2 attributes in AD to locate the user account: mail (their primary
email address) and proxyAddresses (a multivalue attribute containing
their mail aliases). I also control the mount point in which the mail is
located with another attribute in AD, in this case I used "pager". 
  
I have dovecot 1.2.15 and there are no immediate plans to upgrade it.
 
I configured Dovecot's deliver process in order to integrate sieve
capability. I have configured userdb ldap and passdb ldap in Dovecot and
have set up master and client sockets. I am using maildir format for
directory layout.
 
The problem is to set the variables home and mail that will define the
mail location. The format must be like this: 
home: /Mailboxes/<mount point>/<user login>/
mail: /Mailboxes/<mount point>/<user login>/Maildir
 
So, for a particular user (Login: user1, smtp: user1 at domain1.com, alias
smtp: user1_alias at domain1.com) the variables will be:
home: /Mailboxes/AdmUsers/user1/
mail: /Mailboxes/AdmUsers/user1/Maildir
 
Active Directory has the values in: mail:(user1 at domain1.com),
proxyAddresses:(user1_alias at domain1.com), sAMAaccountName(user1).
 
I have defined home and mail in dovecot-ldap.conf. 
 
# User attributes are given in LDAP-name=dovecot-internal-name list. The
# internal names are:
#   uid - System UID
#   gid - System GID
#   home - Home directory
#   mail - Mail location
#
# There are also other special fields which can be returned, see
# http://wiki.dovecot.org/UserDatabase/ExtraFields
user_attrs = pager=home=/mailboxes/%$/%u,mobile=quota_rule=*:storage=%$M
 
If the mail is sent to the Principal SMTP (user1 at domain1.com) in which
the user part (%u) is the same as sAMAccountName, it works. The variable
home is set correctly (home: /Mailboxes/AdmUsers/user1/). The problem is
when the mail is sent to the smtp alias, in which the variable home is
set incorrectly (home: /Mailboxes/AdmUsers/user1_alias/).
 
There is a way to set two values to user_attrs?, in this case I would
need to set pager and sAMAccountName (instead of %u), to it.
 
Thanking you in anticipation...
 
 
Attached is the out of dovecot -n
 
# 1.2.15: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-5-686 i686 Debian 6.0.7
log_path: /var/log/dovecot.log
protocols: imap imaps pop3 pop3s
disable_plaintext_auth: no
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
mail_uid: 16343
mail_gid: 16343
mail_location: maildir:~/Maildir
mail_debug: yes
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_plugins(default): autocreate deleted_to_trash quota imap_quota
expire
mail_plugins(imap): autocreate deleted_to_trash quota imap_quota expire
mail_plugins(pop3): quota expire
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
imap_client_workarounds(default): delay-newmail outlook-idle
netscape-eoh
imap_client_workarounds(imap): delay-newmail outlook-idle netscape-eoh
imap_client_workarounds(pop3):
pop3_client_workarounds(default):
pop3_client_workarounds(imap):
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
lda:
  postmaster_address: postmaster at domain1.com
  mail_plugins: quota expire
  log_path: /var/log/dovecot.log
auth default:
  mechanisms: gssapi gss-spnego login ntlm plain
  username_format: %Ln
  use_winbind: yes
  passdb:
    driver: pam
  userdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf
  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
plugin:
  autocreate: Deleted Items
  autocreate: Sent Items
  autosubscribe: Deleted Items
  autosubscribe: Sent Items
  deleted_to_trash_folder: Sent Items
  quota: maildir:User quota
  quota_rule: *:storage=100M
  quota_rule2: Deleted Items:ignore
  quota_warning: storage=80%% /etc/dovecot/scripts/quota-warning.sh 80
  quota_warning2: storage=90%% /etc/dovecot/scripts/quota-warning.sh 90
  quota_warning3: storage=99%% /etc/dovecot/scripts/quota-exceeded.sh
100
  expire: "Deleted Items" 1 "Deleted Items/*" 1
  expire_dict: proxy::expire
dict:
  expire: pgsql:/etc/dovecot/dovecot-dict-expire.conf
 


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