Re: [exim] Case-(In)sensitive Plus Addressing with Maildir Delivery?

[Rich, Whidbey Telecom]

On Mar 2, 2007, at 2:18 AM, Magnus Holmgren wrote:

On Wednesday 28 February 2007 21:03, Rich, Whidbey Telecom wrote:

I've begun testing "plus addressing" to support the delivery of email
such as "[EMAIL PROTECTED]" to a user-created IMAP folder:

/var/mail/user/Maildir/.topic/new/

[...
local_transport:
         driver = appendfile
         create_directory = false
         maildir_format = true
        ...
         directory = /var/mail/$local_part/Maildir${if exists{/var/
mail/$local_part/Maildir/.${substr_1:$local_part_suffix}}{/.$
{substr_1:$local_part_suffix}}{}}

Tip: use match to avoid repetition:

          directory = /var/mail/$local_part/Maildir${if match
                 {$local_part_suffix}{.(.*)} {${if exists{/var/
                  mail/$local_part/Maildir/.$1}{/.$1}}}}

(with reservation for brace mismatch).

Thanks for the tip!

It delivers to the "topic" Maildir only if the user has already
created it.  Otherwise, it's delivered to their top-level Maildir.

However, I've hit a snag with the case-(in)sensitive nature of
addressing.  Despite the RFC's, users are accustomed to the fact that
"[EMAIL PROTECTED]", "[EMAIL PROTECTED]" and "[EMAIL PROTECTED]" will be
delivered to the same "user".  Some systems and web-forms even
lowercase addresses.  However, a message addressed to "user
[EMAIL PROTECTED]" doesn't match a directory named "Topic" on an ext3
filesystem.

Does anyone have a suggestion to tell Exim how to deliver to "Topic",
even if the $local_part_suffix is "topic"?  We realize one solution
is to force all IMAP folders to be lower-case, but would prefer to
explore other options.

initial caps (optionally after trying "topic" as is)? The latter is
relatively easy at least.

Do you want completely caseless matching or just transform everything to

Thanks again,

Rich

We'd preferrably like caseless matching (so that "user+sometopic" could match "SomeTopic", "Sometopic", "SOMEtopic"). Is there anyone using a caseless file system for mail storage, such as HFS+, in a Linux production environment? Otherwise, could we get "user+sometopic" to at least try "Sometopic", since it's most common, before going to "topic", then a default Maildir?

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