Whitelist network address for fail2ban

I used SME server for mail server (since 2009) and now found Nethserver is better options, I am happy with nethserver and using nethserver since 1 year. I want to whitelist whole network address (some domain using third party mail services and sending mails from range of ip addresses.) I know it is not possible from Webbased server manager. is there any simple steps to create custom template and add Network address ?



I am dumb. I misread. Sorry.

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Here’s a custom template example of adding DynDNS IPs, just to give a direction: