[exim] Mailma3 integrations

Hello,

  I installed and configured mailman3  along with exim in a server. 
The router and transport configuration as follows,

# Mailman 3
mailman3_router:
  driver = accept
  domains = !$primary_hostname : +local_domains
  local_parts = +path_safe_localparts
  require_files = /var/lib/mailman/lists/${local_part}.${domain}
  no_check_local_user
  local_part_suffix_optional
  local_part_suffix = \
     -bounces   : -bounces+* : \
     -confirm   : -confirm+* : \
     -join      : -leave     : \
     -owner     : -request   : \
     -subscribe : -unsubscribe
  transport = mailman3_transport

mailman3_transport:
  driver = smtp
  protocol = lmtp
  allow_localhost
  interface = 127.0.0.1
  hosts = localhost
  port = 8024
  rcpt_include_affixes = true


  Everything on mailmal3 is ok , except exim is not delivering to
mailman lmtp service on 127.0.0.1:8024  it is sending the following
error log,

1mhAnW-004vCv-It == my-list@??? R=mailman3_router
T=mailman3_transport defer (-32) DT=0.000s: failed to lookup IP address
for localhost

Can some one point me to the correct direction. ?




--
Regards
Sherin A