At the moment, there are a lot of issues with emails using newer generation top-level-domains such as the one I use would like to use with App42 (e.g. firstname.lastname@example.org).
I cannot create users with an email address ending with a TLD such as .games, neither can I send out emails from my account using the Email Service API or the User Interface (the email address I am trying to use is email@example.com).
Creating a user with such an email address returns an internal error with the API, whereas sending out the Email simply returns an "OK" without ever sending out the mail. My configuration is correct, I triple checked it before posting here and it should work. I tested it using plain Java with the same settings.
I would like to request that you make new top level domains accessible please.