Dovecot LDA with Exim
=====================

System users
------------

Change the localuser router to use dovecot_delivery transport:

---%<-------------------------------------------------------------------------
localuser:
  driver = accept
  check_local_user
# local_part_suffix = +* : -*
# local_part_suffix_optional
  transport = dovecot_delivery
---%<-------------------------------------------------------------------------

'check_local_user' is required. It makes Exim execute the transport with the
user's UID and GID and it also sets HOME environment.

Next create a new transport for Dovecot deliver:

---%<-------------------------------------------------------------------------
dovecot_delivery:
  driver = pipe
  command = /usr/local/libexec/dovecot/deliver
# use /usr/lib/dovecot/deliver  if using Debian's package
  message_prefix =
  message_suffix =
  log_output
  delivery_date_add
  envelope_to_add
  return_path_add
  #group = mail
  #mode = 0660
---%<-------------------------------------------------------------------------

Deliver is now run using the local user's UID and GID. The mail is delivered to
the location specified by<mail_location> [MailLocation.txt] setting. Note that
the above configuration doesn't do any<userdb> [UserDatabase.txt] lookups, so
you can't have any per-user configuration. If you want that, see the virtual
user setup below.

Virtual users
-------------

Make sure that 'check_local_user' isn't set in the router.

Single UID
----------

Configure the transport to run as the user you want, for example vmail:

---%<-------------------------------------------------------------------------
dovecot_virtual_delivery:
  driver = pipe
  command = /usr/local/libexec/dovecot/deliver -d $local_part@$domain
  message_prefix =
  message_suffix =
  delivery_date_add
  envelope_to_add
  return_path_add
  log_output
  user = vmail
---%<-------------------------------------------------------------------------

You'll also need to have a master authentication socket and give vmail user
access to it. See<LDA.txt> for more information.

Multiple UIDs
-------------

If you need multiple uids/gids you'll need to set deliver setuid root. See the
<LDA.txt> main page how to do this securely.

You could alternatively set 'user = root', but this requires that you built
Exim without root being in FIXED_NEVER_USERS list.

(This file was created from the wiki on 2009-02-04 04:42)
