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Could Sendy offer a development license since we need to test this on dev server at first.
But the URL restrict by the license and we can't install it on separate server.
Or can we point a sub domain to a different dev server for test purpose?
To run Sendy on localhost on your licensed domain, you can do the following:
Create an A record in your DNS (eg. localhost.yourdomain.com) and point it to your local IPv4 address. Here's how to find your local IPv4 address:
Once done, you can access an address like http://localhost.yourdomain.com/sendy (if Sendy's files are in /sendy/ folder of course) and it will load Sendy from your local computer.