I‘m using notmyhostna.me as my email address and every time I have to provide it in person or on the phone I kinda regret it because people seem to not know much about TLDs.
In my experience, having an email address ending with any custom domain other than "gmail.com" raises questions and clarifications are necessary quite often.
And I always think: "you went to the effort to get a domain name and put a website up, but you couldn't go the one more step and have your email point there too?" Especially since you likely hired a web company to do the website, why didn't they also do the email? At least in these cases a company's web-savvyness (or grammar) don't necessarily affect their building skill.
Because nobody knows why "business1@gmail.com" and "business2@gmail.com" are actually different businesses, but "business1@stavros.com" and "business2@stavros.com" aren't. Who knows if your domain is a mail provider or not, or what a domain is, or how mail servers work, etc etc.