postfix:
  smtpd_banner: $myhostname ESMTP $mail_name (Ubuntu)
  biff: no

  append_dot_mydomain: no

  readme_directory: no

  smtpd_tls_cert_file: /etc/ssl/certs/ssl-cert-snakeoil.pem
  smtpd_tls_key_file: /etc/ssl/private/ssl-cert-snakeoil.key
  smtpd_use_tls: yes
  smtpd_tls_session_cache_database: btree:${data_directory}/smtpd_scache
  smtp_tls_session_cache_database: btree:${data_directory}/smtp_scache

  myhostname: localhost
  alias_maps: hash:/etc/aliases
  alias_database: hash:/etc/aliases
  mydestination: localhost, localhost.localdomain, , localhost
  relayhost: 
  mynetworks: 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
  mailbox_size_limit: 0
  recipient_delimiter: +
  inet_interfaces: all