Add Postfix configuration to the repository, make Postfix listen onlocal interfaces only

modules/postfix/files/main.cf

Index: modules/postfix/files/main.cf
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+# See /usr/share/postfix/main.cf.dist for a commented, more complete version
+
+
+# Debian specific:  Specifying a file name will cause the first
+# line of that file to be used as the name.  The Debian default
+# is /etc/mailname.
+#myorigin = /etc/mailname
+
+smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
+biff = no
+
+# appending .domain is the MUA's job.
+append_dot_mydomain = no
+
+# Uncomment the next line to generate "delayed mail" warnings
+#delay_warning_time = 4h
+
+readme_directory = no
+
+# TLS parameters
+smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
+smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
+smtpd_use_tls=no
+smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
+smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
+
+# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
+# information on enabling SSL in the smtp client.
+
+myhostname = localhost
+alias_maps = hash:/etc/aliases
+alias_database = hash:/etc/aliases
+mydestination = 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 = 127.0.0.1 [::1]