INBOX subfolders not showing up

[Matthias Sitte]

Hi,

I have a problem with INBOX subfolders and subscriptions which I can't 
solve... Maybe somebody has seen this, too...

I can create regular subfolders (not in INBOX) and (un-)subscribe to 
them with Thunderbird.  If I create subfolders in the INBOX with TB this 
seems to work now in v31 (just found this out), but with v24.6 neither 
INBOX subfolder creation nor subscriptions worked.  When I modified the 
`subscriptions' file manually on the server, the folders would show up 
in TB, though.

Maybe this was a TB bug, but quite similarly INBOX subfolders don't show 
up on iPhones (iOS up-to-date), but all other subfolders do.

Any ideas what's going on?

Best,
   Matthias

======================================================================

# dovecot -n
# 2.1.7: /etc/dovecot/dovecot.conf
# OS: Linux 3.2.0-4-amd64 x86_64 Debian 7.6 ext4
hostname = familie-sitte.org
log_path = /var/log/dovecot.log
log_timestamp = "%Y-%m-%d %H:%M:%S "
mail_location = maildir:/srv/mail/%d/%n/Maildir:LAYOUT=fs
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 ihave
namespace inbox {
   inbox = yes
   list = 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 = /
   subscriptions = yes
   type = private
}
passdb {
   args = /etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
plugin {
   quota = maildir:User quota
   quota_warning = storage=95%% quota-warning 95 %u
   quota_warning2 = storage=80%% quota-warning 80 %u
   sieve = ~/.dovecot.sieve
   sieve_dir = ~/sieve
}
postmaster_address = postmaster at familie-sitte.org
protocols = " imap sieve pop3"
service auth {
   unix_listener /var/spool/postfix/private/auth {
     group = postfix
     mode = 0660
     user = postfix
   }
}
service imap-login {
   inet_listener imaps {
     port = 993
     ssl = yes
   }
}
service managesieve-login {
   inet_listener sieve {
     port = 4190
   }
}
service quota-warning {
   executable = script /usr/local/bin/quota-warning.sh
   unix_listener quota-warning {
     user = vmail
   }
   user = dovecot
}
ssl_cert = </etc/dovecot/ssl/mail_cert.pem
ssl_cipher_list = 
SSDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA256:EECDH+aRSA+RC4:EDH+aRSA:EECDH:RC4:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS
ssl_key = </etc/dovecot/ssl/mail_key.pem
userdb {
   args = uid=vmail gid=vmail home=/srv/mail/%d/%n
   driver = static
}
protocol lda {
   mail_plugins = " quota sieve"
}
protocol imap {
   mail_plugins = " imap_quota quota"
}