listen on all port 25
listen on 127.0.0.1 port 30025 tag scanned_out
listen on 127.0.0.1 port 40025 tag scanned_in
table aliases db:/etc/aliases.db
accept for local alias <aliases> deliver to mbox
accept tagged scanned_in for domain "example.com" virtual <users> deliver to mbox
accept tagged scanned_out for any relay
accept from any for domain "example.com" relay via smtp://127.0.0.1:10025
accept from source 10.0.0.0/24 for any relay via smtp://127.0.0.1:20025