dovecot - Jun 2008 - Caseless folder delivery?

I'm using exim4 to deliver into dovecot 1.1, and using plus-addressing to 
deliver mailing lists directly to appropriate folders in my "lists"
mailbox.
  I created a file called /folder-map.lists that looks like

## folder-map.lists
dovecot: Dovecot
lpedge: Linux PowerEdge

... and so on.  So mail to lists-lpedge at jay.fm goes to the "Linux
PowerEdge"
folder.

The one annoying thing: I'd like to avoid creating explicit folder-map 
entries where the plus-address suffix is identical an existing folder name. 
  That *almost* works, but I like to name my folders with appropriate 
capitalization, and deliver doesn't seem to have a way to do
"caseless"
delivery.

For instance, ideally, I wouldn't have to create the "dovecot:
Dovecot"
entry; mail to my lists-dovecot at jay.fm address would go into the
"Dovecot"
folder.

I can't figure out how to do this.  Is there a way to do that using deliver?
  Could there be?  Relevant portions of the exim configuration follow. 
(And, p.s., am I using the new -a and -m options correctly?  Are they used 
for anything yet?)

Jay Levitt



## exim.conf

...begin routers

ORIG_FOLDER = ${substr_1:$local_part_suffix}
FOLDER_MAP  = /etc/exim/folder-map.$local_part
MAPPED_FOLDER = ${lookup{ORIG_FOLDER}lsearch{FOLDER_MAP}{$value}{ORIG_FOLDER}}


# Mailboxes whose localparts are folders
foldered_mailboxes:
   driver = accept
   local_part_suffix = +* : -*
   local_part_suffix_optional
   local_parts = +foldered_mailboxes
   address_data = user=$local_part folder="MAPPED_FOLDER"
   transport = dovecot_virtual_delivery

...begin transports

dovecot_virtual_delivery:
   driver = pipe
   command = /usr/local/libexec/dovecot/deliver \
         -f $return_path \
         -a $local_part$local_part_suffix@$domain \
         -d ${extract{user}{$address_data}} \
         -m "${extract{folder}{$address_data}}" -n
   message_prefix    message_suffix    log_output
   return_path_add
   user = vmail

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On Sat, 14 Jun 2008, Jay Levitt wrote:
> For instance, ideally, I wouldn't have to create the "dovecot:
Dovecot"
> entry; mail to my lists-dovecot at jay.fm address would go into the
"Dovecot"
> folder.
Well, Unix filesystems tned to be case-sensitive, hence, when mailing to
lists-dOvCot@ should deliver also know to use "Dovecot"? I do not know
nothing about exim, but Dovecot deliver itself cannot do this, it had to 
test all combinations of case of letters otherwise.

However, deliver is programmed straight forward, there is an easy to find 
spot, where the actual deliver of the mail takes palce. You could add some 
code there, e.g.:

Check if you can open a mailbox map file in the home directory of the
user (or mailbox root dir), if so compare any line with the destination
case-insensitively; on match, use the name from the file.
To scan through the directory all the time, can be very time consuming.

Or, more easy but fixed:
Mangle the argument of -m (if it's not INBOX), e.g. by lower-caseing all 
but the first character or something like that.

The other alternative is to switch to a filesystem that does not enforce
case-senstivity, e.g. "case-preserving" or what it's called, e.g.
NTFS,
FAT32 or Apple HFS+.  Well, you do not want to do this, I guess.
Hey, out of curiosity, I googled and found:
http://freshmeat.net/projects/ciopfs/?branch_id=74414&release_id=277441

Bye,

- -- 
Steffen Kaiser
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