I plan to running an unreal engine in AWS instance. It will use your library for sending emails. I am concern about security issues. Normal you lock down all ports by default except for ssh and even then it is based to only open them up to second machine you remote login into for ssh PEM key and connect from there to the machine but your libraries make http request to validate your keys on the web. What ports would I have to allow out to make sure your key validation is secure and can it be hacked to access to the machine?
Shawn