master.cf

#
# Postfix master process configuration file.  For details on the format
# of the file, see the master(5) manual page (command: "man 5 master" or
# on-line: http://www.postfix.org/master.5.html).
#
# Do not forget to execute "postfix reload" after editing this file.
#
# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (no)    (never) (100)
# ==========================================================================
smtp      inet  n       -       y       -       -       smtpd
  -o content_filter=scan:127.0.0.1:10025
  -o receive_override_options=no_address_mappings
  -o milter_protocol=6
  -o milter_default_action=accept
  -o smtpd_milters=unix:opendkim/opendkim.sock
  -o non_smtpd_milters=unix:opendkim/opendkim.sock

#
# This is the "advanced" after-queue filter.
#
# Read more here:
# http://www.postfix.org/FILTER_README.html
# http://opendkim.org/opendkim.8.html#OPERATION
#
scan      unix  -       -       y       -       100      smtp
  -o smtp_send_xforward_command=yes
  -o disable_mime_output_conversion=yes
  -o smtp_generic_maps=
  -o smtp_tls_security_level=none

# Here's the "reuptake" port, where you can add the opendkim signer.
127.0.0.1:10026 inet  n       -       y       -       100      smtpd
  -o content_filter=
  -o receive_override_options=no_unknown_recipient_checks,no_header_body_checks
  -o smtpd_tls_security_level=none
  -o smtpd_helo_restrictions=
  -o smtpd_client_restrictions=
  -o smtpd_sender_restrictions=
  -o milter_protocol=6
  -o milter_default_action=accept
  -o smtpd_milters=unix:opendkim/opendkim.sock
  -o non_smtpd_milters=unix:opendkim/opendkim.sock
  -o smtpd_relay_restrictions=
  -o smtpd_recipient_restrictions=permit_mynetworks,reject
  -o mynetworks=127.0.0.0/8
  -o smtpd_authorized_xforward_hosts=127.0.0.0/8