Secure Computing SG300 User Manual page 194

Check Transparent.
If all of your internal email clients (such as Microsoft Outlook) are retrieving email from a
single mail server only, enter it as the Default POP server. Uncheck Allow
connections to other POP servers.
If most, but not all, of your internal email clients are retrieving email from a single mail
server, enter this as the Default POP server. Check Allow connections to other POP
servers.
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Firewall