It's funny how some of those systems try to correct anything that doesn't look like one of the big email providers. I use a custom domain for mail, and I can be

It's funny how some of those systems try to correct anything that doesn't look like one of the big email providers. I use a custom domain for mail, and I can be 100% sure that it doesn't even look remotely like any well-known mail provider's domain, yet a very well-known website I tried to sign up for warned me that there is most likely a typo in my email address.