### router/400_exim4-config_system_aliases
#################################

# This router handles aliasing using a traditional /etc/aliases file.
#
##### NB  You must ensure that /etc/aliases exists. It used to be the case
##### NB  that every Unix had that file, because it was the Sendmail default.
##### NB  These days, there are systems that don't have it. Your aliases
##### NB  file should at least contain an alias for "postmaster".
#
# This router handles the local part in a case-insensitive way which
# satisfies the RFCs requirement that postmaster be reachable regardless
# of case. If you decide to handle /etc/aliases in a caseful way, you
# need to make arrangements for a caseless postmaster.
#
# Delivery to arbitrary directories, files, and piping to programs in
# /etc/aliases is disabled per default.
# If that is a problem for you, see
#   /usr/share/doc/exim4-base/README.Debian.gz
# for explanation and some workarounds.

system_aliases:
  debug_print = "R: system_aliases for $local_part@$domain"
  driver = redirect
  domains = +local_domains
  allow_fail
  allow_defer
  data = ${lookup{$local_part}lsearch{/etc/aliases}}
  .ifdef SYSTEM_ALIASES_USER
  user = SYSTEM_ALIASES_USER
  .endif
  .ifdef SYSTEM_ALIASES_GROUP
  group = SYSTEM_ALIASES_GROUP
  .endif
  .ifdef SYSTEM_ALIASES_FILE_TRANSPORT
  file_transport = SYSTEM_ALIASES_FILE_TRANSPORT
  .endif
  .ifdef SYSTEM_ALIASES_PIPE_TRANSPORT
  pipe_transport = SYSTEM_ALIASES_PIPE_TRANSPORT
  .endif
  .ifdef SYSTEM_ALIASES_DIRECTORY_TRANSPORT
  directory_transport = SYSTEM_ALIASES_DIRECTORY_TRANSPORT
  .endif