Yes, it's highly recommended to have a custom domain name for your business email address. Not only does it give you a more professional image, but it also helps with brand recognition and trustworthiness. By having an email address that matches your company's website domain, customers will be able to easily identify and remember who they're communicating with. Plus, using a free email service like Gmail or Yahoo can make it seem like you're not taking your business seriously. Investing in a custom domain name shows that you value your company's online presence and are committed to providing the best possible customer experience.