dovecot - Sep 2013 - Read-only account through INDEX=MEMORY:CONTROL=MEMORY and non-writable Unix-permissions

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Hi,

my goal is to provide a special mailbox for some mail accounts. The user 
should get the information, to look somewhere else. The user must not 
change anything at all. I also don't want to provide a mailbox for each 
user.

I got the setup below, which seems to run with Dovecot v2.2; however, 
"CONTROL=MEMORY" is not documented. Is the setup stable for next
versions
of Dovecot or is CONTROL=MEMORY not a feature, but a bug?

=====
user settings:

home=/home/nomailbox 
mail=maildir:/home/nomailbox/Maildir:INDEX=MEMORY:CONTROL=MEMORY
uid=vmail
gid=vmail

The structure of the directory:

/home/nomailbox/:
total 12
drwxr-xr-x  3 root root 4096 Oct 24  2007 ./
drwxr-xr-x 18 root root 4096 Sep  9 10:36 ../
dr-xr-xr-x  5 root root 4096 Oct 24  2007 Maildir/

/home/nomailbox/Maildir:
total 20
dr-xr-xr-x 5 root root 4096 Oct 24  2007 ./
drwxr-xr-x 3 root root 4096 Oct 24  2007 ../
dr-xr-xr-x 2 root root 4096 Oct 24  2007 cur/
dr-xr-xr-x 2 root root 4096 Sep  9 08:23 new/
dr-xr-xr-- 2 root root 4096 Oct 24  2007 tmp/

/home/nomailbox/Maildir/cur:
total 8
dr-xr-xr-x 2 root root 4096 Oct 24  2007 ./
dr-xr-xr-x 5 root root 4096 Oct 24  2007 ../
- -rw-r--r-- 1 root root    0 Oct 24  2007 .placeholder

/home/nomailbox/Maildir/new:
total 12
dr-xr-xr-x 2 root root 4096 Sep  9 08:23 ./
dr-xr-xr-x 5 root root 4096 Oct 24  2007 ../
- -r--r--r-- 1 root root  804 Sep  9 08:24 no-mailbox-for-you

/home/nomailbox/Maildir/tmp:
total 8
dr-xr-xr-- 2 root root 4096 Oct 24  2007 ./
dr-xr-xr-x 5 root root 4096 Oct 24  2007 ../


- -- 
Steffen Kaiser
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On 9.9.2013, at 14.52, Steffen Kaiser <skdovecot at smail.inf.fh-brs.de>
wrote:
> my goal is to provide a special mailbox for some mail accounts. The user
should get the information, to look somewhere else. The user must not change
anything at all. I also don't want to provide a mailbox for each user.
> 
> I got the setup below, which seems to run with Dovecot v2.2; however,
"CONTROL=MEMORY" is not documented. Is the setup stable for next
versions of Dovecot or is CONTROL=MEMORY not a feature, but a bug?
CONTROL=MEMORY means that it's actually using a directory named MEMORY in
the home directory.