[horde] Auto creation of special folders?

[Bjoern Voigt]

I want to specify custom folder names for special folders (sent
mails, templates etc.).

I use Courier IMAP as IMAP backend and Horde Groupware 5.2.10.
Courier IMAP uses "INBOX." as a folder prefix, e.g. folder "Sent" is
"INBOX.Sent".

Unfortunately Horde seems to ignore my folder names. Instead of my
names (e.g. "postponed" for drafts) it creates folders with standard
names (e.g. "Drafts") during login.

My horde/imp/backends.local.php file

<?php
$servers['imap']['port']=143;
$servers['imap']['maildomain']='mydomain.com';
$servers['imap']['secure']=false;
# Syntax variant 1
# $servers['imap']['special_mboxes']=array(
#      IMP_Mailbox::MBOX_DRAFTS => 'postponed',
#      IMP_Mailbox::MBOX_SENT => 'Sent',
#      IMP_Mailbox::MBOX_SPAM => 'Junk-E-Mail',
#      IMP_Mailbox::MBOX_TEMPLATES => 'Templates',
#      IMP_Mailbox::MBOX_TRASH => 'Trash',
#   );
# Syntax variant 2
$servers['imap']['special_mboxes'][IMP_Mailbox::MBOX_DRAFTS] =
'postponed';
$servers['imap']['special_mboxes'][IMP_Mailbox::MBOX_SENT] = 'Sent';
$servers['imap']['special_mboxes'][IMP_Mailbox::MBOX_SPAM] =
'Junk-E-Mail';
$servers['imap']['special_mboxes'][IMP_Mailbox::MBOX_TEMPLATES] =
'Templates';
$servers['imap']['special_mboxes'][IMP_Mailbox::MBOX_TRASH] = 'Trash';

$servers['imap']['autocreate_special'] = true;
?>

The IMAP dump shows, that my folder names already exists (I created
them manually). But Horde creates folders with standard names:

* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE
THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL
ACL2=UNION STARTTLS XMAGICTRASH] Courier-IMAP ready. Copyright
1998-2011 Double Precision, Inc.  See COPYING for distribution
information.
A0001 LOGIN testuser testpassword
A0001 OK LOGIN Ok.
2 CAPABILITY
* CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE
THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL
ACL2=UNION XMAGICTRASH
2 OK CAPABILITY completed
C64 EXAMINE ""
C64 NO Mailbox does not exist, or must be subscribed to.
2 NAMESPACE
* NAMESPACE (("INBOX." ".")) NIL (("#shared." ".")("shared." "."))
2 OK NAMESPACE completed.
3 LSUB "" INBOX
3 OK LSUB completed
4 LSUB "" INBOX.*
4 OK LSUB completed
5 LSUB "" #shared.*
5 OK LSUB completed
6 LSUB "" shared.*
6 OK LSUB completed
7 LIST "" INBOX
* LIST (\Unmarked \HasChildren) "." "INBOX"
7 OK LIST completed
8 LIST "" INBOX.*
* LIST (\HasNoChildren) "." "INBOX.Trash"
* LIST (\HasNoChildren) "." "INBOX.postponed"
* LIST (\HasNoChildren) "." "INBOX.Junk-E-Mail"
* LIST (\HasNoChildren) "." "INBOX.Sent"
8 OK LIST completed
9 LIST "" #shared.*
9 OK LIST completed
10 LIST "" shared.*
10 OK LIST completed
11 EXAMINE INBOX
* FLAGS (\Draft \Answered \Flagged \Deleted \Seen \Recent)
* OK [PERMANENTFLAGS ()] No permanent flags permitted
* 0 EXISTS
* 0 RECENT
* OK [UIDVALIDITY 441399963] Ok
* OK [MYRIGHTS "acdilrsw"] ACL
11 OK [READ-ONLY] Ok
C64 EXAMINE ""
C64 NO Mailbox does not exist, or must be subscribed to.
2 LIST "" *
* LIST (\HasNoChildren) "." "INBOX.Trash"
* LIST (\HasNoChildren) "." "INBOX.postponed"
* LIST (\HasNoChildren) "." "INBOX.Junk-E-Mail"
* LIST (\HasNoChildren) "." "INBOX.Sent"
* LIST (\Unmarked \HasChildren) "." "INBOX"
2 OK LIST completed
3 LIST "" *
* LIST (\HasNoChildren) "." "INBOX.Trash"
* LIST (\HasNoChildren) "." "INBOX.postponed"
* LIST (\HasNoChildren) "." "INBOX.Junk-E-Mail"
* LIST (\HasNoChildren) "." "INBOX.Sent"
* LIST (\Unmarked \HasChildren) "." "INBOX"
3 OK LIST completed
4 NAMESPACE
* NAMESPACE (("INBOX." ".")) NIL (("#shared." ".")("shared." "."))
4 OK NAMESPACE completed.
5 LSUB "" 1
5 OK LSUB completed
6 LIST "" 1
6 OK LIST completed
7 LSUB "" INBOX.Templates
7 OK LSUB completed
8 LIST "" INBOX.Templates
8 OK LIST completed
9 CREATE INBOX.Templates
9 OK "INBOX.Templates" created.
10 SUBSCRIBE INBOX.Templates
10 OK Folder subscribed.
11 LSUB "" INBOX.Templates
* LSUB (\HasNoChildren) "." "INBOX.Templates"
11 OK LSUB completed
12 LIST "" INBOX.Templates
* LIST (\HasNoChildren) "." "INBOX.Templates"
12 OK LIST completed
13 LSUB "" INBOX.Drafts
13 OK LSUB completed
14 LIST "" INBOX.Drafts
14 OK LIST completed
15 CREATE INBOX.Drafts
15 OK "INBOX.Drafts" created.
16 SUBSCRIBE INBOX.Drafts
16 OK Folder subscribed.
17 LSUB "" INBOX.Drafts
* LSUB (\HasNoChildren) "." "INBOX.Drafts"
17 OK LSUB completed
18 LIST "" INBOX.Drafts
* LIST (\HasNoChildren) "." "INBOX.Drafts"
18 OK LIST completed
19 LSUB "" INBOX.Sent
19 OK LSUB completed
20 LIST "" INBOX.Sent
* LIST (\HasNoChildren) "." "INBOX.Sent"
20 OK LIST completed
21 LSUB "" INBOX.Spam
21 OK LSUB completed
22 LIST "" INBOX.Spam
22 OK LIST completed
23 CREATE INBOX.Spam
23 OK "INBOX.Spam" created.
24 SUBSCRIBE INBOX.Spam
24 OK Folder subscribed.
25 LSUB "" INBOX.Spam
* LSUB (\HasNoChildren) "." "INBOX.Spam"
25 OK LSUB completed
26 LIST "" INBOX.Spam
* LIST (\HasNoChildren) "." "INBOX.Spam"
26 OK LIST completed
27 SELECT INBOX
* FLAGS (\Draft \Answered \Flagged \Deleted \Seen \Recent)
* OK [PERMANENTFLAGS (\* \Draft \Answered \Flagged \Deleted \Seen)]
Limited
* 0 EXISTS
* 0 RECENT
* OK [UIDVALIDITY 441399965] Ok
* OK [MYRIGHTS "acdilrsw"] ACL
27 OK [READ-WRITE] Ok
C64 EXAMINE ""
C64 NO Mailbox does not exist, or must be subscribed to.

An additional problem is, that I am unable to select my own folder
name (e.g. "postponed" in Webmail -> Drafts) until I started the
Mail app and subscribed the folder.

Any idea, what is wrong here?

Greetings,
Björn