In a world where spam is hitting this Discourse hard, we ask that you include some way for us to verify that you’re a real human (and not a bot) when requesting an account.
We’re not going to spell out exactly what we’re looking for—that would kind of defeat the purpose. 
However, one thing that definitely helps is having an actual Mail-in-a-Box (MIAB) server running and using that email address.
There are probably other creative ways to prove you’re legit, too. Use your best judgment!
Thanks!