Views:
  • Configure your proxy-based firewall, as follows:
    • Outgoing SMTP messages go to Postfix first and then to the IMSS server or the switch performing load balancing between scanners.
    • Incoming SMTP messages go first to Postfix, then to IMSS, and then to the SMTP servers in the domain.
  • Configure your packet-based firewall, as follows:
    • Change the MX records on the DNS server that currently reference your SMTP gateway to reference the address of the server hosting IMSS.
    • Point your MX records to IMSS or the firewall, if you configured it to manage a secure subnet.
  • Configure IMSS to route messages destined for your local domain(s) to the SMTP gateway or your internal mail server.
  • Configure relay restriction to only allow relay for local domain(s).