[Gllug] Exim and virtual domains

[Xander D Harkness]

On Thu, 2002-05-16 at 09:55, Paul Brazier wrote:
> Can someone give me some pointers to setting up "virtual domains" in
> Exim?
> Is this what exim calls "directors"? The documentation looks very
> comprehensive but assumes you know all the jargon etc.
> 
> The box has the domain "mydomain.com" say but I also have DNS A, MX, etc
> records set up for "foo.com" and "bar.com" to point to the same IP
> address. For starters it would be nice just to bounce mail for
> fred at bar.com to another email say fred at fredsisp.net. Then maybe also
> have local spools so people can pick up email by pop3.
> I have this kind of setup with postfix on another box and although it's
> slightly tricky to set up it does work.
> 
> I've looked into /etc/aliases but I'm not sure if this is just for local
> users - I tried adding an outside email to this but I think it thought I
> was trying to use it as a relay and gave me an error.
> 
> Can Exim even do this (I'm sure I've seen this topic before but couldn't
> see it in the archives) or do I need something more heavyweight like
> Courier?
> 
> Are there any simple introductions to Exim either online or in print? Is
> the O'Reilly Exim book any good?

I thought you might also be interested in this example which I took of
the exim list some time ago:

From: 	Marc Perkel <marc at nospamperkel.com>
To: 	exim-users at exim.org
Subject: 	[Exim] Linuxconf vdeliver and exim - virtual domains
Date: 	14 Nov 2001 10:56:33 -0800	
I got Linuxconf and it's vdeliver program working with exim. I also have
exim scripts that do the same thing as vdeliver. I'm just going to cut
some of my code into this message so it can be used by anyone who's
interested in making this work.

I'm still trying to work on the guy who writes linuxconf to create an
exim interface. So far no luck. If there are any programmers here I
think it could be done easilly.

Here's the director:

virtual_localuser_vdeliver:
  driver = smartuser
  transport = vdeliver
  require_files = /etc/vmail/passwd.$domain
  domains = lsearch;/etc/exim/vdomains
  condition=${lookup {$local_part} lsearch {/etc/vmail/passwd.$domain}
{$value}}

And the transport:

vdeliver:
  driver = pipe
  command = /usr/lib/linuxconf/lib/vdeliver $local_part $domain
  current_directory = /
  return_path_add
  envelope_to_add
  delivery_date_add
  return_output
  user = root
  group = root

Additionally - here's exim code to do the same things:

# This transport handles virtual domains using local delivery.-
linuxconf format

virtual_local_delivery:
  driver = appendfile
  create_directory = true
  directory_mode = 700
  file = /var/spool/vmail/${domain}/${local_part}
  delivery_date_add
  envelope_to_add
  return_path_add
  allow_symlink
  user = ${extract{2} {:} {${lookup {$local_part} lsearch
{/etc/vmail/passwd.$domain} {$value}}}}
  group = mail
  mode = 600

# This director matches virtual local user mailboxes.

virtual_localuser:
  driver = smartuser
  transport = virtual_local_delivery
#  transport = vdeliver
  require_files = /etc/vmail/passwd.$domain
  domains = lsearch;/etc/exim/vdomains
  condition=${lookup {$local_part} lsearch {/etc/vmail/passwd.$domain}
{$value}}

---------------------------------
Additionally - I handle aliases and .forward files:

# This director handles virtual user aliases the same was alias files
# are handled

virtual_alias:
   driver = aliasfile
   user = root
   expand
   file_transport = address_file
   pipe_transport = address_pipe
   domains = lsearch;/etc/exim/vdomains
   require_files = /etc/vmail/aliases.$domain
   file = /etc/vmail/aliases.$domain
   search_type = lsearch*
   qualify_preserve_domain

userforward:
  driver = forwardfile
  require_files = /etc/vmail/passwd.$domain
  condition = ${lookup {$local_part} lsearch {/etc/vmail/passwd.$domain}
{$value}}
  file =
${lookup{$local_part}lsearch{/etc/vmail/passwd.$domain}{${extract{5}{:}{$value}}/.forward}}

  no_verify
  no_expn
  no_check_local_user
  check_ancestor
  filter
  skip_syntax_errors
  file_transport = address_file
  pipe_transport = address_pipe
  reply_transport = address_reply

----------------------------
And: I have virtual domain forwarding and fallback domains:

######################################################################
#                      REWRITE CONFIGURATION                         #
######################################################################

# The /etc/exim/domainaliases file contains a list of domain aliases

# mydomain.net: mydomain.com
# mydomain.org: mydomain.com

*@*
${lookup{$2}lsearch{/etc/exim/domainaliases}{$local_part@$value}{$local_part@$domain}}
E
*@mail.* $1@$2



# VIRTUAL DOMAIN FALLBACK

# If there is no alias and local delivery fails, but there is an
alternative
# domain name to forward unsent mail to, then fallbackdomain picks up
the new
# name and resends the message. Thus if a message is sent to domain1.com
and
# there are not matching user mailboxes or aliases, then the message is
# forwarded to the same user at domain2.com. Domains can be chained.

# The file format is as follows:
#    domain1.com: domain2.com
#    domain2.com: domain3.com

fallbackdomain:
  user=root
  driver = smartuser
  condition=${lookup{$domain}lsearch{/etc/exim/domainfallback}{$value}}
  new_address =
${lookup{$domain}lsearch{/etc/exim/domainfallback}{$local_part@$value}{$local_part@$domain}}



end

------------------

Hope this is useful. Enjoy!



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