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The XG Series hardware appliances will reach end-of-life (EOL) on March 31, 2025. Click here to see the XG to XGS migration documentation.

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https://docs.sophos.com/nsg/sophos-firewall/21.0/Help/en-us/webhelp/onlinehelp/index.html?contextId=email-IP-reputation

Turn on IP reputation

You can turn on IP reputation to block or allow inbound and outbound emails based on the sender's IP address.

If you turn it on, Sophos Firewall looks for the sender’s IP address in the database of IP addresses to determine whether a message is spam and takes action.

To turn on IP reputation, do as follows:

  1. Go to Email > General settings.
  2. Under SMTP settings, do one of the following:
    • For MTA mode, select Reject based on IP reputation.
    • For legacy mode, select Verify sender's IP reputation.
  3. Click Apply.

General settings apply to all emails. Sophos Firewall implements these settings and then the SMTP and POP-IMAP policies.