A lot of web hosting ISP's will give you this service but not give you any extra email boxes. You spent the money for your domain name. You have this coming to you. One of the most important reasons to configure unlimited email with your web hosting ISP is SPAM control. If you've been on the internet for very long you probably don't like it much either.
Help is here.
Using the power of your very own domain configured for unlimited email you can put a complete and total stop to unsolicited email once and for all. If you're like most web site owners you give them your main email address like you would when you sign up for any other offer on the web. This is where you just messed up. Now you'll get spammed and you'll have no idea where it came from. The possibilities are endless for ways you can use and exploit your email capabilities.