Forum sign up not possible
Sorry for [cross post](https://github.com/Araq/Nim/issues/2446) -- just for sake of completeness.

None of my email addresses are allowed, due to the apparent restrictions:
- Addresses can have at most 30 characters (as a hard limit on the input box).
- University addresses (e.g., `kit.edu`) are not accepted as a valid domain (results in: `Error: Invalid email address`).
