SMTP server with single IP address connected to Internet

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In this configuration SpamFilter is installed on the same server as your SMTP software. The server only has one IP address available, SpamFilter will need to be configured to listen on port 25 so it can accept email traffic. Your SMTP software will need to be reconfigured to listen on a different port, for example port 26. SpamFilter will then forward clean emails to your SMTP server on port 26.All your email clients will need to be reconfigured so that their "Outgoing SMTP server" now points to your SMTP server on port 26. Alternatively, you may choose to let your email clients relay thru SpamFilter. Please note that in order to do so, you will need to configure IP whitelists in SpamFilter to specify the IPs from which your clients can relay from.

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