The local IP address range defines which machines are allowed to send email to external address using your server. By default, the IP address range will be your C-Class address.
Using the Security>Local IP page you can define which IP addresses are ?trusted? IP addresses. You may need to increase the range to include other C-Class addresses or single, specific IP addresses.
If you need to allow users outside these ranges to use your server, see Q0173.
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