It's 2019. If your business doesn't have a professional email address, I don't take you seriously...and either do your customers.
If you are using a Gmail, Yahoo or AOL email address for your business, your first impression to many is that you're not a serious business.
The service that your business provides is a commodity so it is SO important to do all of the other little things to set yourself apart.
Stop playing small. Stop making excuses. Stop being cheap.