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https://docs.sophos.com/support/surf/en-us/index.html?contextId=sf-critical-email-settings-open-relays

Email settings should not allow open relays

Critical

Explanation

Adding Any in Protect > Email > Relay settings > Host based relay will result to open relay, allowing anyone on the internet to send emails through Sophos Firewall. Set only the specified host or enable authenticated relay.

Resolution

  1. Go to Protect > Email > Relay settings > Host based relay.
  2. Remove Any from the Allow relay from hosts/networks.