[Exim] Exim + Courier-IMAP delivery of email to shared folde…

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Autor: Michael J. Tubby B.Sc. G8TIC
Data:  
Para: exim-users
Asunto: [Exim] Exim + Courier-IMAP delivery of email to shared folders/sub-folders
All,

I'm running Exim and Courier-IMAP on a production mail
system for our company and we want to expand the way in
which we use shared IMAP folders.

We have a number of customers (sales), a number of customer-
projects, a number of software projects etc. Each is now
grouped by shared folder, sub-folder, etc. sort of like this:

SharedFolder
|
|
+--sales
| |
| |-customer1
| |-customer2
| |-customer3

|
+--project
| |
| |-widget
| |-fred
| |-bert
| |-jim

|
+--software
|  |
|  |-microsnot
|  |-linux
|  |-thorcom
|  |-gnu
|  |-other
|      |
|      |-goodstuff
|      |-rubbish

|
+--sysadmin

and I have Courier-IMAP serving this heirarchy well.


Currently I have Exim able to deliver email to the upper-
level of the shared folders directly using an email address
like:

sales@???
projects@???
software@@our-domain.org

I have done this my creating a director and a transport for
the purpose as follows:

#
# This director handles special 'users' (mail addresses) which we want
# delivered directly into Maildir format shared folders.
#
# This is after system_aliases so that the aliases file can group things
# to fewer folders here
#
shared_folders:
local_parts = "sales:project:software:sysadmin"
driver = smartuser
transport = maildir_shared_folder


#
# This transport saves messages in shared folders for special users
# defined in the 'shared_folders' director - to allow workgroup
# style mail handling with Courier IMAP server (and clients which support
# shared folders)
#
maildir_shared_folder:
driver = appendfile
maildir_format
directory = /SharedFolders/.${local_part}/
create_directory
prefix = ""
suffix = ""
check_string = ""
escape_string = ""
delivery_date_add
envelope_to_add
return_path_add
mode = 777
group = shrmail
user = shrmail


Now what I would like to do is to expand the system to be able to
deliver into the sub-folders using email addresses like:

project.widget@???
software.microsnot@???

preferrably without having to specify them all in the "local_parts"
in the director (since there may be hundreds of them in time), ie.
I'd like to come up with a way in which $local_part was matched
against a prefix list "project, sales, software" and if successful
stripped for the second part and a delivery then attempted on the
resulting shared folder path.

Courier IMAP stores its folder heirarchy using dots, eg.

.../SharedFolder/.project
.../SharedFolder/.project.widget
.../SharedFolder/.software
.../SharedFolder/.software.microsnot
.../SharedFolder/.software.other
.../SharedFolder/.software.other.goodstuff
.../SharedFolder/.software.other.rubbish


Ideally it should be possible to extend the scheme further to
support sub-sub-folders and corrosponding email addresses, eg.

software.other.rubbish@???


If mail is sent to a non-existent shared folder path, eg.

software.trs80@???

then it should bounce.



Any ideas on a good/scalable way to do this appreciated.



Regards


Mike Tubby