Hello from Russia!
When I was trying to registr here, I had a little problem.
I input *@yandex.ru as email. I had an error "The e-mail address you entered is not allowed to be used."
I try this with *@mail.ru. I had the same error.
So I had need no write *@gmail.com. It worked, but it was uncomfortably.
So I ask you to add maintenance of russian e-mail providers.
p.s. yandex.ru and mail.ru is the main email providers in russian-speaking countries