If a company is unhappy with me because "you can't have our name in your email address" I just spell their name backwards, that usually shuts them up and we can

If a company is unhappy with me because "you can't have our name in your email address" I just spell their name backwards, that usually shuts them up and we can all move on with our day. I had one small business owner so confused "but that's our domain name, we own it, you can't have it in your email address".