Date: 6 Oct 1998
From: Philip Hazel

These are suggested parts of a configuration for looking up users in 
/etc/passwd.domain rather than in /etc/passwd, with a separate alias file for 
each domain as well. Delivery takes place into a mailbox within a per-domain 
directory, though a different transport could of course be substituted. The
delivery process is run as user exim, group mail. The list of domains is kept
in /etc/customer/domains.

# Transport: Place this in the "transports" section of the configuration.

virtual_localdelivery:
  driver = appendfile
  file = /var/spool/mail/${domain}/${local_part}
  user = exim 
  group = mail
  mode = 660
  
# Directors: Place these two directors in the "directors" section of the
# configuration. DO NOT put them immediately after the transport driver
# just defined - that's the wrong part of the configuration file. 
 
# This director handles aliases. Because it has no transport setting, it
# just expands local parts that it recognizes into new addresses.
 
virtual_alias:
   driver = aliasfile
   domains = lsearch;/etc/customer/domains
   file = /etc/customer/${domain}.aliases
   search_type = lsearch
   qualify_preserve_domain 

# This director checks local parts. It *does* have a transport setting, so
# if it finds a local part in the file, the message is directed to that
# transport. The data following the local part in the file is not used.
 
virtual_localuser:
   driver = aliasfile
   transport = virtual_localdelivery
   domains = lsearch;/etc/customer/domains
   file = /etc/passwd.$domain
   search_type = lsearch  
   no_more