Hi,
While I was checking old bug I once reported (that one seems to be fixed, https://www.dovecot.org/list/dovecot/2017-January/106593.html) I discovered another issue happening under current version when user sharing his mailbox (with Maildir storage) is not visible under user using mdbox (or sdbox, also tested) - unless subscriptions file is manually adjusted (after subscribing).
Consider following config:
# 2.3.15 (0503334ab1): /etc/dovecot/dovecot.conf # OS: Linux 5.12.14-arch1-1 x86_64 Arch Linux btrfs # Hostname: hakai auth_debug = yes auth_mechanisms = plain login disable_plaintext_auth = no first_valid_uid = 1 listen = * mail_debug = yes mail_gid = dovecot mail_location = maildir:/var/mail1/%n/Maildir mail_plugins = acl mail_uid = dovecot namespace { inbox = yes location = prefix = separator = / type = private } namespace shared1 { inbox = no list = yes location = maildir:%%h/Maildir/ prefix = shared1/%%n/ separator = / subscriptions = no type = shared } namespace shared2 { inbox = no list = yes location = mdbox:%%h/mdbox/ prefix = shared2/%%n/ separator = / subscriptions = no type = shared } passdb { args = /etc/dovecot/local-maildir driver = passwd-file } passdb { args = /etc/dovecot/local-mdbox driver = passwd-file } plugin { acl = vfile acl_shared_dict = file:/var/mail-data/shared-database/shared-mailboxes.db } protocols = imap service auth { unix_listener auth-userdb { group = mail mode = 0660 user = dovecot } user = dovecot } service imap-login { inet_listener imap { address = * port = 143 } inet_listener imaps { address = * port = 993 } user = dovecot } service imap { executable = /usr/lib/dovecot/imap } userdb { driver = prefetch } userdb { args = /etc/dovecot/local-maildir driver = passwd-file } userdb { args = /etc/dovecot/local-mdbox driver = passwd-file } protocol imap { mail_max_userip_connections = 100 mail_plugins = acl imap_acl }
/etc/dovecot/local-maildir:
user1:{PLAIN}test:::user1:/var/mail1/user1::userdb_mail=maildir:/var/mail1/user1/Maildir userdb_home=/var/mail1/user1 user2:{PLAIN}test:::user2:/var/mail1/user2::userdb_mail=maildir:/var/mail1/user2/Maildir userdb_home=/var/mail1/user2
/etc/dovecot/local-mdbox:
user3:{PLAIN}test:::user3:/var/mail2/user3::userdb_mail=mdbox:/var/mail2/user3/mdbox userdb_home=/var/mail2/user3
There are two shared namespaces - shared1 for Maildir mailboxes and shared2 for mdbox ones. 'user1' is sharing his 'qwer' folder to user3.
doveadm mailbox create -u user1 -s qwer doveadm acl add -u user1 qwer user=user3 read lookup doveadm mailbox subscribe -u user3 shared1/user1/qwer
This produces subscriptions file such as:
14:44 # cat /var/mail2/user3/mdbox/subscriptions V 2
Trash shared1 user1 qwer
With all that in place, 'qwer' won't be visible to user3. But if we change the 'shared1 user1 qwer' to shared1/user1/qwer - then everything will be working fine.
Sharing mdbox folder to maildir user (user3 -> user1) as well as maildir to maildir (user1 -> user2) works without issues.