proxymap unix - - n - - proxymap
proxywrite unix - - n - 1 proxymap
smtp unix - - - - - smtp
+smtp inet n - - - - smtpd
+#
+# Before-filter SMTP server. Receive mail from the network and
+# pass it to the content filter on localhost port 10025.
+#
+#smtp inet n - - - 15 smtpd
+# -o smtpd_proxy_filter=127.0.0.1:10025
+# -o smtpd_client_connection_count_limit=10
+#
+# After-filter SMTP server. Receive mail from the content filter
+# on localhost port 10026.
+#
+#127.0.0.1:10026 inet n - n - - smtpd
+# -o smtpd_authorized_xforward_hosts=127.0.0.0/8
+# -o smtpd_client_restrictions=
+# -o smtpd_helo_restrictions=
+# -o smtpd_sender_restrictions=
+# -o smtpd_recipient_restrictions=permit_mynetworks,reject
+# -o smtpd_data_restrictions=
+# -o mynetworks=127.0.0.0/8
+# -o receive_override_options=no_unknown_recipient_checks
+
# When relaying mail as backup MX, disable fallback_relay to avoid MX loops
relay unix - - - - - smtp
-o smtp_fallback_relay=