system_aliases:
driver = redirect
allow_defer
allow_fail
data = ${lookup{$local_part}lsearch{/etc/aliases}}
file_transport = address_file
pipe_transport = address_pipe
retry_use_local_part
# user = exim
localuser:
driver = accept
check_local_user
condition = "${if eq {$domain} {$primary_hostname} {yes} {no}}"
transport = local_delivery