Procedure

1. Go to Administration → System Settings → Operation Mode.
2. Click Add Rule.
   The Add SPAN/TAP Mode Rule window appears.
3. Type the Source IP address, Destination IP address, and SMTP port to monitor.

   Note If a field is empty, all SMTP traffic for that option is monitored. For example, when Source IP address is empty, SMTP traffic from all sources is monitored.

4. Click Add.