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we setup the sendy at a domain working with amazon cloudfront, where the server not open for public.
when we try to login we get amazon server name with no internet acess where the server locked for public
Your server must be online so that you can access Sendy. Opens tracking, click tracking, web version links and unsubscribe links all require the server to be online otherwise everything will be broken. Also without your server being online, there's no way Sendy can communicate with Amazon SES API.