Accessing Shared Mailbox not working

Quiwy dovecot at quiwy.ninja
Tue Nov 15 16:57:06 UTC 2022 

Hi,

I'm new on this mailing list and I'm struggling with the configuration 
of shared mailboxes.


I've followed the following documentation page : 
https://doc.dovecot.org/configuration_manual/shared_mailboxes/shared_mailboxes/ 
and manage to had it working for something like 2 minutes, but then 
changed a parameter and can't get it back working (and of course I don't 
remember which one it was).


I'm using dovecot 2.3.13 .


user at hostname:~# dovecot -n
# 2.3.13 (89f716dc2): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.13 (cdd19fe3)
# OS: Linux 5.10.0-19-amd64 x86_64 Debian 11.5
# Hostname: hostname
auth_mechanisms = plain login
dict {
   acl = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext
}
mail_debug = yes
mail_home = /var/vmail/%d/%n
mail_location = maildir:~/
mail_plugins = acl
mail_privileged_group = mail
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope 
encoded-character vacation subaddress comparator-i;ascii-numeric 
relational regex imap4flags copy include variables body enotify 
environment mailbox date index ihave duplicate mime foreverypart extracttext
namespace {
   list = yes
   location = 
maildir:/var/mail/vmail/%%d/%%n/Maildir:INDEXPVT=/var/mail/vmail/%%d/%%n/Maildir/shared/%n
   prefix = shared/%%u/
   separator = /
   subscriptions = no
   type = shared
}
namespace inbox {
   inbox = yes
   location =
   mailbox Drafts {
     special_use = \Drafts
   }
   mailbox Junk {
     special_use = \Junk
   }
   mailbox Sent {
     special_use = \Sent
   }
   mailbox "Sent Messages" {
     special_use = \Sent
   }
   mailbox Trash {
     special_use = \Trash
   }
   prefix =
   separator = /
   type = private
}
passdb {
   args = /etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
plugin {
   acl = vfile
   acl_shared_dict = proxy::acl
   sieve = file:~/sieve;active=~/.dovecot.sieve
}
protocols = " imap sieve"
service auth {
   unix_listener /var/spool/postfix/private/auth {
     group = postfix
     mode = 0660
     user = postfix
   }
   unix_listener auth-userdb {
     mode = 0600
     user = vmail
   }
   user = dovecot
}
ssl_cert = </etc/letsencrypt/live/domain/fullchain.pem
ssl_client_ca_dir = /etc/ssl/certs
ssl_dh = # hidden, use -P to show it
ssl_key = # hidden, use -P to show it
userdb {
   args = uid=vmail gid=vmail home=/var/mail/vmail/%d/%n
   driver = static
}
protocol imap {
   mail_plugins = acl imap_acl imap_acl
}
protocol lda {
   mail_plugins = acl sieve
}


This is the content of dovecot-dict-sql.conf.ext :

cat dovecot-dict-sql.conf.ext
# This file is commonly accessed via dict {} section in dovecot.conf

connect = host=localhost dbname=my_dbname user=my_admin_db_user 
password=my_password

map {
   pattern = shared/shared-boxes/user/$to/$from
   table = user_shares
   value_field = dummy

   fields {
     from_user = $from
     to_user = $to
   }
}

map {
   pattern = shared/shared-boxes/anyone/$from
   table = anyone_shares
   value_field = dummy

   fields {
     from_user = $from
   }
}

Now, I have configured some rigth through SOGo interface as I need to 
use it.

With doveadm I can see the good rights :

doveadm acl get -u user1 at domain INBOX
ID                                    Global Rights
user=user2 at devops.algoo.net         lookup read
user=user3 at devops.algoo.net        admin create delete expunge insert 
lookup post read write write-deleted write-seen


This this the output I have from journalctl -f command with debug 
enabled when trying to access to the shared folder within SOGo :

Nov 15 17:51:14 hostname dovecot[269267]: imap-login: Login: 
user=<user3 at domain>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, 
mpid=270025, secured, session=<UL//KYXt7ul/AAAB>
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: Loading 
modules from directory: /usr/lib/dovecot/modules
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: Module loaded: 
/usr/lib/dovecot/modules/lib01_acl_plugin.so
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: Module loaded: 
/usr/lib/dovecot/modules/lib02_imap_acl_plugin.so
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: Effective uid=5000, 
gid=5000, home=/var/mail/vmail/domain/user3
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: Namespace inbox: 
type=private, prefix=, sep=/, inbox=yes, hidden=no, list=yes, 
subscriptions=yes location=maildir:~/
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: maildir++: 
root=/var/mail/vmail/domain/user3, index=, indexpvt=, control=, 
inbox=/var/mail/vmail/domain/user3, alt=
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: acl: initializing 
backend with data: vfile
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: acl: acl username = 
user3 at domain
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: acl: owner = 1
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: acl vfile: Global 
ACLs disabled
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: Namespace : 
type=shared, prefix=shared/%u/, sep=/, inbox=no, hidden=no, list=yes, 
subscriptions=no 
location=maildir:/var/mail/vmail/%d/%n/Maildir:INDEXPVT=/var/mail/vmail/%d/%n/Maildir/shared/user3
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: shared: 
root=/run/dovecot, index=, indexpvt=, control=, inbox=, alt=
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: acl: initializing 
backend with data: vfile
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: acl: acl username = 
user3 at domain
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: acl: owner = 0
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: acl vfile: Global 
ACLs disabled
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: Mailbox 
INBOX/folder_i_want_to_share_from_user1_to_user3: Mailbox opened 
because: SELECT
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Debug: acl vfile: reading 
file 
/var/mail/vmail/domain/user3/.INBOX.folder_i_want_to_share_from_user1_to_user3/dovecot-acl
Nov 15 17:51:14 hostname dovecot[269267]: 
imap(user3 at domain)<270025><UL//KYXt7ul/AAAB>: Logged out in=140 out=1521 
deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 
body_bytes=0
Nov 15 17:51:15 hostname dovecot[269267]: imap-login: Login: 
user=<user3 at domain>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, 
mpid=270028, secured, session=<IDgGKoXt/Ol/AAAB>
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: Loading modules 
from directory: /usr/lib/dovecot/modules
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: Module loaded: 
/usr/lib/dovecot/modules/lib01_acl_plugin.so
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: Module loaded: 
/usr/lib/dovecot/modules/lib02_imap_acl_plugin.so
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: Effective uid=5000, 
gid=5000, home=/var/mail/vmail/domain/user3
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: Namespace inbox: 
type=private, prefix=, sep=/, inbox=yes, hidden=no, list=yes, 
subscriptions=yes location=maildir:~/
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: maildir++: 
root=/var/mail/vmail/domain/user3, index=, indexpvt=, control=, 
inbox=/var/mail/vmail/domain/user3, alt=
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: acl: initializing 
backend with data: vfile
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: acl: acl username = 
user3 at domain
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: acl: owner = 1
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: acl vfile: Global 
ACLs disabled
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: Namespace : 
type=shared, prefix=shared/%u/, sep=/, inbox=no, hidden=no, list=yes, 
subscriptions=no 
location=maildir:/var/mail/vmail/%d/%n/Maildir:INDEXPVT=/var/mail/vmail/%d/%n/Maildir/shared/user3
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: shared: 
root=/run/dovecot, index=, indexpvt=, control=, inbox=, alt=
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: acl: initializing 
backend with data: vfile
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: acl: acl username = 
user3 at domain
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: acl: owner = 0
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: acl vfile: Global 
ACLs disabled
Nov 15 17:51:15 hostname dovecot[269267]: imap-login: Login: 
user=<user3 at domain>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, 
mpid=270029, secured, session=<7mIGKoXtAOp/AAAB>
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: Loading modules 
from directory: /usr/lib/dovecot/modules
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: Module loaded: 
/usr/lib/dovecot/modules/lib01_acl_plugin.so
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: Module loaded: 
/usr/lib/dovecot/modules/lib02_imap_acl_plugin.so
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: Effective uid=5000, 
gid=5000, home=/var/mail/vmail/domain/user3
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: Namespace inbox: 
type=private, prefix=, sep=/, inbox=yes, hidden=no, list=yes, 
subscriptions=yes location=maildir:~/
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: maildir++: 
root=/var/mail/vmail/domain/user3, index=, indexpvt=, control=, 
inbox=/var/mail/vmail/domain/user3, alt=
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl: initializing 
backend with data: vfile
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl: acl username = 
user3 at domain
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl: owner = 1
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl vfile: Global 
ACLs disabled
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: Namespace : 
type=shared, prefix=shared/%u/, sep=/, inbox=no, hidden=no, list=yes, 
subscriptions=no 
location=maildir:/var/mail/vmail/%d/%n/Maildir:INDEXPVT=/var/mail/vmail/%d/%n/Maildir/shared/user3
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: shared: 
root=/run/dovecot, index=, indexpvt=, control=, inbox=, alt=
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl: initializing 
backend with data: vfile
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl: acl username = 
user3 at domain
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl: owner = 0
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl vfile: Global 
ACLs disabled
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl vfile: file 
/var/mail/vmail/domain/user3/dovecot-acl not found
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl vfile: reading 
file 
/var/mail/vmail/domain/user3/.INBOX.folder_i_want_to_share_from_user1_to_user3/dovecot-acl
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: Mailbox INBOX: 
Mailbox opened because: SELECT
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Debug: acl vfile: file 
/var/mail/vmail/domain/user3/dovecot-acl not found
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: maildir++: 
root=/var/mail/vmail/domain/user1/Maildir, index=, 
indexpvt=/var/mail/vmail/domain/user1/Maildir/shared/user3, control=, 
inbox=/var/mail/vmail/domain/user1/Maildir, alt=
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl: initializing 
backend with data: vfile
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl: acl username = 
user1 at domain
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl: owner = 1
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl vfile: Global 
ACLs disabled
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: maildir++: 
root=/var/mail/vmail/domain/user1/Maildir, index=, 
indexpvt=/var/mail/vmail/domain/user1/Maildir/shared/user3, control=, 
inbox=/var/mail/vmail/domain/user1/Maildir, alt=
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl: initializing 
backend with data: vfile
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl: acl username = 
user3 at domain
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl: owner = 0
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl vfile: Global 
ACLs disabled
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl: Mailbox not in 
dovecot-acl-list: shared/user1 at domain
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: acl vfile: file 
/var/mail/vmail/domain/user1/Maildir/dovecot-acl not found
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Debug: Namespace shared/: 
Using permissions from : mode=0700 gid=default
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270028><IDgGKoXt/Ol/AAAB>: Logged out in=198 out=1581 
deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 
body_bytes=0
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270029><7mIGKoXtAOp/AAAB>: Logged out in=125 out=1417 
deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 
body_bytes=0
Nov 15 17:51:15 hostname dovecot[269267]: imap-login: Login: 
user=<user3 at domain>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, 
mpid=270033, secured, session=<B4gIKoXtDOp/AAAB>
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: Loading modules 
from directory: /usr/lib/dovecot/modules
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: Module loaded: 
/usr/lib/dovecot/modules/lib01_acl_plugin.so
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: Module loaded: 
/usr/lib/dovecot/modules/lib02_imap_acl_plugin.so
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: Effective uid=5000, 
gid=5000, home=/var/mail/vmail/domain/user3
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: Namespace inbox: 
type=private, prefix=, sep=/, inbox=yes, hidden=no, list=yes, 
subscriptions=yes location=maildir:~/
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: maildir++: 
root=/var/mail/vmail/domain/user3, index=, indexpvt=, control=, 
inbox=/var/mail/vmail/domain/user3, alt=
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: acl: initializing 
backend with data: vfile
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: acl: acl username = 
user3 at domain
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: acl: owner = 1
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: acl vfile: Global 
ACLs disabled
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: Namespace : 
type=shared, prefix=shared/%u/, sep=/, inbox=no, hidden=no, list=yes, 
subscriptions=no 
location=maildir:/var/mail/vmail/%d/%n/Maildir:INDEXPVT=/var/mail/vmail/%d/%n/Maildir/shared/user3
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: shared: 
root=/run/dovecot, index=, indexpvt=, control=, inbox=, alt=
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: acl: initializing 
backend with data: vfile
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: acl: acl username = 
user3 at domain
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: acl: owner = 0
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: acl vfile: Global 
ACLs disabled
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: Mailbox 
INBOX/folder_i_want_to_share_from_user1_to_user3: Mailbox opened 
because: SELECT
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Debug: acl vfile: reading 
file 
/var/mail/vmail/domain/user3/.INBOX.folder_i_want_to_share_from_user1_to_user3/dovecot-acl
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270033><B4gIKoXtDOp/AAAB>: Logged out in=313 out=2117 
deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=2 body_count=0 
body_bytes=0
Nov 15 17:51:15 hostname dovecot[269267]: imap-login: Login: 
user=<user3 at domain>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, 
mpid=270037, secured, session=<nRkMKoXtFup/AAAB>
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: Loading modules 
from directory: /usr/lib/dovecot/modules
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: Module loaded: 
/usr/lib/dovecot/modules/lib01_acl_plugin.so
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: Module loaded: 
/usr/lib/dovecot/modules/lib02_imap_acl_plugin.so
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: Effective uid=5000, 
gid=5000, home=/var/mail/vmail/domain/user3
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: Namespace inbox: 
type=private, prefix=, sep=/, inbox=yes, hidden=no, list=yes, 
subscriptions=yes location=maildir:~/
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: maildir++: 
root=/var/mail/vmail/domain/user3, index=, indexpvt=, control=, 
inbox=/var/mail/vmail/domain/user3, alt=
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: acl: initializing 
backend with data: vfile
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: acl: acl username = 
user3 at domain
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: acl: owner = 1
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: acl vfile: Global 
ACLs disabled
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: Namespace : 
type=shared, prefix=shared/%u/, sep=/, inbox=no, hidden=no, list=yes, 
subscriptions=no 
location=maildir:/var/mail/vmail/%d/%n/Maildir:INDEXPVT=/var/mail/vmail/%d/%n/Maildir/shared/user3
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: shared: 
root=/run/dovecot, index=, indexpvt=, control=, inbox=, alt=
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: acl: initializing 
backend with data: vfile
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: acl: acl username = 
user3 at domain
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: acl: owner = 0
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: acl vfile: Global 
ACLs disabled
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: Mailbox INBOX: 
Mailbox opened because: SELECT
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: acl vfile: file 
/var/mail/vmail/domain/user3/dovecot-acl not found
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: Mailbox 
INBOX/folder_i_want_to_share_from_user1_to_user3: Mailbox opened 
because: SELECT
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Debug: acl vfile: reading 
file 
/var/mail/vmail/domain/user3/.INBOX.folder_i_want_to_share_from_user1_to_user3/dovecot-acl
Nov 15 17:51:15 hostname dovecot[269267]: 
imap(user3 at domain)<270037><nRkMKoXtFup/AAAB>: Logged out in=218 out=1925 
deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 
body_bytes=0

I tried with thunderbird too but no folders appears neither.


Do you have any clue on which parameter do I need to change in order to 
get it working?


Thank you very much for any help provided.

Quiwy
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