Re: Dovecot 2.4: shared mailboxes not working - maybe related to mail_path

20 Aug 2026


      20.08.26, 15:39 +0200, Markus Schönhaber via dovecot:
...
I have configured this (full doveconf -n output attached):
The list seems to strip text attachments. Therefore the doveconf -n
output inline:
2.4.4-5+debian13 (8b687aa65c): /etc/dovecot/dovecot.conf
Pigeonhole version 2.4.4-5+debian13 (3beb331a)
OS: Linux 7.1.8-1-MANJARO x86_64 Debian 13.6 btrfs
Hostname: dovecot-template
dovecot_config_version = 2.4.4
acl_driver = vfile
auth_master_user_separator = *
auth_mechanisms = plain login
dovecot_storage_version = 2.4.4
log_debug = category=mail
login_log_format_elements = user=<%{user}> method=%{mechanism}
rip=%{remote_ip} lip=%{local_ip} lport=%{local_port} mpid=%{mail_pid}
%{secured}
mail_driver = mdbox
mail_gid = vmail
mail_home = /var/spool/vmail/home/%{user | domain}/%{user | username}
mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename
mail_log_fields = uid box msgid size
mail_path = /var/spool/vmail/mail/%{user | domain}/%{user | username}
mail_plugins = quota acl
mail_uid = vmail
postmaster_address = postmaster@example.org
protocols = imap sieve
sieve_global_extensions {
vnd.dovecot.environment = yes
vnd.dovecot.execute = yes
vnd.dovecot.pipe = yes
}
sieve_pipe_bin_dir = /var/spool/vmail/home/3-imapsieve
sieve_plugins = sieve_imapsieve sieve_extprograms
sieve_redirect_envelope_from = orig_recipient
sql_driver = mysql
verbose_proctitle = yes
mysql localhost {
dbname = postfixadmin
password = # hidden, use -P to show it
user = postfixadmin
}
passdb sql {
driver = sql
query = SELECT mailbox.username AS user, mailbox.password AS password,
CONCAT(mailbox.quota, 'B') AS userdb_quota_storage_size, 'vmail' AS
userdb_uid, 'vmail' AS userdb_gid FROM mailbox INNER JOIN domain ON
mailbox.domain = domain.domain WHERE mailbox.username = '%{user}' AND
mailbox.active = '1' AND domain.active = '1'
}
userdb prefetch {
driver = prefetch
}
userdb sql {
driver = sql
iterate_query = SELECT username AS user FROM mailbox WHERE active = 1
query = SELECT username AS user, 'vmail' AS uid, 'vmail' AS gid,
CONCAT(quota, 'B') AS quota_storage_size FROM mailbox WHERE username =
'%{user}' AND active='1'
}
event_exporter log {
driver = log
format = json
time_format = rfc3339
}
metric imap_id {
exporter = log
filter = event=imap_id_received
}
namespace public {
mail_home = /var/spool/vmail/home/Public
mail_path = /var/spool/vmail/mail/Public
list = children
prefix = Public/
separator = /
subscriptions = no
type = public
}
namespace shared {
mail_home = /var/spool/vmail/home/%{owner_domain}/%{owner_username}
list = children
prefix = shared/$domain/$username/
separator = /
subscriptions = no
type = shared
}
namespace inbox {
inbox = yes
separator = /
}
service auth {
unix_listener /var/spool/postfix/private/auth {
group = postfix
mode = 0666
user = postfix
}
}
ssl_server {
cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
key_file = /etc/ssl/private/ssl-cert-snakeoil.key
}
protocol imap {
mail_plugins {
imap_acl = yes
imap_quota = yes
imap_sieve = yes
}
}
acl_sharing_map {
dict file {
path = /var/spool/vmail/home/shared-mailboxes
}
}
quota "User quota" {
}
dict_server {
dict mysql {
driver = sql
sql_driver = mysql
dict_map priv/quota/messages {
sql_table = quota2
username_field = username
dict_map_value_field messages {
}
}
dict_map priv/quota/storage {
sql_table = quota2
username_field = username
dict_map_value_field bytes {
}
}
}
}
quota_clone {
dict proxy {
name = mysql
}
}
sieve_script personal {
active_path = ~/.dovecot.sieve
driver = file
path = ~/sieve
}
sieve_script after-0 {
driver = file
path = /var/spool/vmail/home/1-global/sieve/after
type = after
}
sieve_script before-0 {
driver = file
path = /var/spool/vmail/home/1-global/sieve/before
type = before
}