INBOX sharing does not work

18 Aug 2020


      Hello!
INBOX sharing does not seem to work, although all other mailboxes work.
User bar@example.de has shared a few mailboxes:
# doveadm acl get -u bar@example.de INBOX
ID                  Global Rights
user=foo@example.de        lookup read write-seen
# doveadm acl get -u bar@example.de Sent
ID                  Global Rights
user=foo@example.de        lookup read write-seen
# doveadm acl get -u bar@example.de Drafts
ID                  Global Rights
user=foo@example.de        lookup read write-seen
But user foo@example.de can't see the shared INBOX:
# doveadm mailbox list -u foo@example.de
Trash
Sent
Drafts
Junk
shared
shared/bar@example.de
shared/bar@example.de/Sent
shared/bar@example.de/Drafts
INBOX
A review of the ACL does not explain the behaviour:
# doveadm acl debug -u foo@example.de shared/bar@example.de/INBOX
doveadm(foo@example.de): Info: Mailbox 'INBOX' is in namespace
'shared/bar@example.de/'
doveadm(foo@example.de): Info: Mailbox path:
/srv/mail-storage/mailhome/example.de/bar/Maildir
doveadm(foo@example.de): Info: Per-user private flags in mailbox: \Seen
doveadm(foo@example.de): Info: User foo@example.de has rights: lookup
read write-seen
doveadm(foo@example.de): Info: Mailbox found from dovecot-acl-list
doveadm(foo@example.de): Info: User bar@example.de found from ACL
shared dict
doveadm(foo@example.de): Info: Mailbox shared/bar@example.de/INBOX is
visible in LIST
----------  doveconf -n  ----------
# 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.4 ()
# OS: Linux 4.19.0-10-amd64 x86_64 Debian 10.5
# Hostname: XXX.YYYY.de
auth_master_user_separator = *
auth_verbose = yes
first_valid_gid = 401
first_valid_uid = 401
last_valid_gid = 401
last_valid_uid = 401
mail_gid = vmail
mail_home = /srv/mail-storage/mailhome/%d/%n
mail_location = maildir:~/Maildir
mail_plugins = " acl listescape zlib"
mail_uid = vmail
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 inbox {
inbox = yes
location =
mailbox Drafts {
auto = subscribe
special_use = \Drafts
}
mailbox Junk {
auto = create
special_use = \Junk
}
mailbox Sent {
auto = subscribe
special_use = \Sent
}
mailbox "Sent Messages" {
auto = no
special_use = \Sent
}
mailbox Trash {
auto = subscribe
special_use = \Trash
}
prefix =
separator = /
type = private
}
namespace shared {
list = children
location =
maildir:/srv/mail-storage/mailhome/%%d/%%n/Maildir:INDEXPVT=~/Maildir/shared/%%d/%%n
prefix = shared/%%u/
separator = /
subscriptions = yes
type = shared
}
passdb {
args = /etc/dovecot/master-users
driver = passwd-file
master = yes
pass = yes
}
passdb {
args = /etc/dovecot/dovecot-ldap.conf.ext
driver = ldap
}
plugin {
acl = vfile
acl_shared_dict = file:/srv/mail-storage/mailhome/shared-mailboxes.db
sieve = file:~/sieve;active=~/.dovecot.sieve
zlib_save = gz
zlib_save_level = 6
}
protocols = " imap lmtp sieve"
service auth {
unix_listener auth-userdb {
mode = 0777
}
}
ssl = required
ssl_cert = 
I don't think it is relevant, but I don't want to forget to mention that
/srv/mail-storage/ is an NFS share.
It would bee nice if someone has a hint. I hope it isn't a bug.
Regards Torsten