In this episode I talk about some basic firewall rules that many organizations don’t have in place.

Download: Episode 5: Fun Firewall Rules – part 1 (audio)

Show notes:

  • Block outbound port TCP 25 for all devices except your mail server(s).
  • If you use a third party mail filter like Postini or Securence, ensure that only their IPs are allowed to send mail directly to your environment.
  • Check your mail server config as far as what devices are allowed to relay anonymously to the outside world.
  • Take advantage of outbound smarthosting to filter outgoing spam.


Written by: Brian Johnson

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