Help > Forum > Users > Using an email address as the username
Using an email address as the username
Your forum users cannot use an email address as their username. This is because the usernames are publicly displayed on the forum. Publicly displaying email addresses would be a security risk and would result in spammers collecting those email addresses to send spam emails.
Users can still log in to your forum using their email address or username.
If you'd like to require users to have a username that identifies them more specifically, you can enforce a Username Format like "First Name, Last Name", "Last Name, First Name", etc.