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