Update docker-setup.sh

docker-setup.sh

@@ -15,6 +15,9 @@ function setup_conf_and_secret {
     #postmap /etc/postfix/relay_passwd
 }
 
+    postconf -e "relayhost = [$MTP_RELAY]:$MTP_PORT"
+    postconf -e 'mynetworks = 127.0.0.0/8 192.168.32.0/19 172.19.0.0/16'
+
 if [ -z "$MTP_INTERFACES" ]; then
   postconf -e "inet_interfaces = all"
 else