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#6
Re: Handling mail for non-system users with Exim4?
Posted by ineiti (81.221.xx.xx) on Fri 2 Dec 2005 at 15:52

I started with a simple system where you can have aliases for each domain (I also have multiple domains). Then I added the possibility to have virtual users. But as I (still) don't like databases, I did it in a more directory-oriented way. In
/etc/exim4/conf.d/router/360_exim4-local_vdom_aliases
I have the following:

#
# First we look up in /etc/exim4/virtual, if we have to do any aliasas,
# based on the virtual domains!
#
vdom_aliases:
      driver = redirect
      allow_defer
      allow_fail
      domains = dsearch;/etc/exim4/virtual
      data = ${expand:${lookup{$local_part}lsearch*@{/etc/exim4/virtual/$domain}}}
      retry_use_local_part
      pipe_transport   = address_pipe
      file_transport   = address_file

#
# Then, if there is no local delivery, let's go and look if we have
# a virtual domain defined at /var/mail/virtual
#
vdom_aliases_maildir:
      debug_print = "R: vdom_aliases_maildir for $local_part@$domain"
      driver = redirect
      allow_defer
      allow_fail
      domains = dsearch;/var/mail/virtual
      data = /var/mail/virtual/$domain/$local_part/
      directory_transport = address_directory
      pipe_transport   = address_pipe
      file_transport   = address_file
      user = vmail
      group = vmail

Now I have two possibilities to influence the mail-delivery of exim:

  1. Use /etc/exim4/virtual/domainname in a "alias"-style way
  2. Add a directory in /var/mail/virtual/domain/name to have mail delivered in there

If I'd have debian.org, I could have
/etc/exim4/virtual/debian.org: 

postmaster : user@localhost
forwarding_adress : user@somewhere.else.org
* : trash@localhost

Furthermore I'd create the directories
/var/mail/virtual/debian.org/user
/var/mail/virtual/debian.org/bug
to have the users "user@debian.org" and "bug@debian.org". Both directories should be owned by user vmail.vmail.

As imap-server I use dovecot with the following line in
/etc/dovecot/dovecot.conf

default_mail_env = maildir:/var/mail/virtual/%d/%n/
and 
auth_userdb = passwd-file /etc/passwd.imap
for the passwords. This serves mail as stored by exim. One can also add symbolic links in there in order to cover local users.

Well, it's a bit hacky, but I wanted something easily extendable (and what is more easy than to write "mkdir -p newdomain.org/user") and I just love my filesystem. (Why does MS want to make the filesystem a DB? One should make the DB a filesystem ;)

Hope it helps,

ineiti

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