So you purchased a domain name for your website, and you want a custom email address under that domain. But the registrar requires you to pay for the email hosting monthly. Though they are usually cheap, paying for email hosting monthly when you can use that custom email address for free would be impractical, especially if you are a small business site owner or the like. Forwarding email addresses won't look good either, as when you reply, the Sent From would show the email address the email has been forwarded to. Solution? Simple. Use Gmail.