======HP - Printers - Firewall ports======

//Based on an HP CM2320fxi MFP // \\
To the printer:
  - http, tcp/80: web access.
  - https, tcp/443: secure web access.
  - tcp/9100: receiving print jobs.
  - snmp, udp/161: for auto-configuration of HP Universal Print Driver.

From the printer:
  - smtp, tcp/25: to mail server.
  - dns, udp/53: to DNS server (needed for scan to e-mail).