dovecot - Feb 2007 - Force "lower case" Folder Creation?

We're exploring the use of "plus addressing" in our MTA (Exim),
which
delivers "user+topic at domain.com" to a user's "topic"
folder.

However, the case-sensitive nature of our ext3 filesystem means that  
a message destined to "topic" won't deliver to a user's
"Topic"
folder.   For example, if a user creates a "Topic" folder, and gives  
"user+Topic at domain.com" to a web form that lower-cases it, delivery
is deferred.

Although we're checking to see if Exim can workaround this, is there  
a way Dovecot (1.0rc24) can force lowercase folder names without a  
patch?  We'd hate to do this but are exploring our options.

Thanks!

Rich


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Rich, Whidbey Telecom wrote:
> 
> However, the case-sensitive nature of our ext3 filesystem means that a 
> message destined to "topic" won't deliver to a user's
"Topic" folder.
> For example, if a user creates a "Topic" folder, and gives 
> "user+Topic at domain.com" to a web form that lower-cases it,
delivery is
> deferred.
While way off topic in this list, why not just do this via the Exim 
filtering? I'll make two assumptions:

- the user has created a folder called 'Topic', knowing they will 
subscribe to a webform using "user+toPiC" (example)

- you employ local_part_suffix options in your 'userforward' router:

   local_part_suffix = +* : -*
   local_part_suffix_optional

Exim filtering will disregard case if the testing condition is 
lowercase, but regard it if it's upper case. A pseudo filter (going off 
the top of my head) for a user might look like:

   if
    $local_part_suffix is "+Topic"
   then
    deliver ${home}/Maildir/.Topic/
    finish
   endif

"is" means 'Topic' will be matched without case;
"IS" will try and match
with case sensitivity.

It doesn't make sense to me to patch Dovecot (which would be difficult 
to maintain unless it's accepted upstream) when you should probably 
could do what you want via Exim's super-powerful lingo.

There's a guy on the exim list who wrote a Fibonacci sequence in ACL 
rules. :) (*)

-te

(*)
http://www.exim.org/mail-archives/exim-users/Week-of-Mon-20050328/msg00086.html

-- 
Troy Engel | Systems Engineer
Fluid, Inc | http://www.fluid.com