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Recently Google has anounced to support the PHP module in their app server, ist possible to implement sendy in Google App Engine?
I've never tried Google App Engine before, you can try.
Overall i can see it possible, but when it comes to the license i doubt it'll works. When you setup sendy, we are require to put a domain name to make it works, any solution to outcome the issue, by default app engine will be using their own domain appspot.com, we'll be using thier subdomain name.
Just request to change your licensed domain to your appspot URL http://sendy.co/#forms