wk2: account management tooling

target/postfix/main.cf

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+# https://doc.dovecot.org/2.4.2/howto/virtual/postgresql.html
+transport_maps = pgsql:/etc/postfix/transport.cf
+virtual_uid_maps = pgsql:/etc/postfix/uids.cf
+virtual_gid_maps = pgsql:/etc/postfix/gids.cf
+# Note that we've set virtual_mailbox_base to /home, which means that it's
+# prefixed to all home directories in SQL database.
+virtual_mailbox_base = /home
+virtual_mailbox_maps = pgsql:/etc/postfix/mailboxes.cf
+virtual_maps = pgsql:/etc/postfix/virtual.cf
+mydestination = $mydomain, $myhostname
+
+smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination
+smtpd_sasl_auth_enable = yes
+smtpd_sasl_security_options = noanonymous
+smtpd_sasl_local_domain = domain.org
+smtp_sasl_auth_enable = no

target/postfix/sasl/smtpd.conf

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+pwcheck_method: saslauthd
+saslauthd_path: /etc/mux
+mech_list: login plain

target/postfix/transport.cf

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+user=mailreader
+# TODO: remove default password
+password=mailreader-secret
+dbname=mails
+table=transport
+select_field=transport
+where_field=domain
+hosts=localhost

target/postfix/uids.cf

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+user=mailreader
+# TODO: remove default password
+password=mailreader-secret
+dbname=mails
+table=users
+select_field=uid
+where_field=userid
+hosts=localhost