The general format of an email address is localpart@domain, and a specific example is jsmith@example.org. An address consists of two parts. The part before the @ sign (localpart) identifies the name of a mailbox. This is often the username of the recipient, e.g., jsmith. The part after the @ symbol is a domain name that represents the administrative realm for the mail box, e.g., a company's domain name, example.com.