As an employer I can tell you straight up one of the first things I notice is someone’s email address. I’ve seen some real good ones too.
Rollingcoal@hotmail.com being one of my favs.
If someone has taken the time to create their own domain and has an actual email address tied to it I automatically think the person is far more professional.
Louis_the_gardener_696969@hotmail.com type emails remind me of spammers.