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127.0.0.1:10025  inet  n - n - - smtpd
  -o content_filter=smtp-service2:[127.0.0.1]:10026
  -o smtpd_recipient_restrictions=permit_mynetworks,reject

smtp-service2     unix -  -       n       -       4       smtp
  -o smtp_send_xforward_command=yes
  -o smtp_data_done_timeout=1200
  -o disable_dns_lookups=yes
  -o smtp_generic_maps=

127.0.0.1:10027  inet  n - n - - smtpd
  -o content_filter=smtp-service3:[127.0.0.1]:10028
  -o smtpd_recipient_restrictions=permit_mynetworks,reject

smtp-service3     unix -  -       n       -       4       smtp
  -o smtp_send_xforward_command=yes
  -o smtp_data_done_timeout=1200
  -o disable_dns_lookups=yes
  -o smtp_generic_maps=

127.0.0.1:10029  inet  n - n - - smtpd
  -o content_filter=
  -o smtpd_recipient_restrictions=permit_mynetworks,reject