I occasionally field questions about how to set up Gmail to retrieve and send email from an external address (such as one set up on a professional domain). If you have your own domain and have set up a POP/SMTP email account with your web host, you should be able to use the following instructions to send and retrieve email from that account in Gmail.

From the main Gmail view (once logged in), go to Settings > Mail settings in the upper right corner of the page.