1. Email Addresses
The domain part consists of a number of items separated by period marks. It identifies an institution or other organisation and sometimes a specific part of the organisation or even an individual server computer.
The name identifies an individual email user. A typical form is the first and last name separated by a period, but other forms using an underscore, initials, a job title, or a one-word server username are all valid. A username may be generated in a numerical series or based on a first or last name, or a job or project title.
email@example.com firstname.lastname@example.org email@example.com firstname.lastname@example.org