Every email address consists of two parts, separated by the @ sign: the username and the domain of the email service. Usernames often contain both uppercase and lowercase letters, and may also contain numbers, underscores, or periods.

Is [email protected] the same as [email protected] when it comes to email servers?

The domain name in an email address is not case sensitive, meaning that it doesn't matter whether you use uppercase or lowercase letters. The same goes for usernames, although outdated email servers can sometimes misinterpret uppercase letters. For simplicity, it's best to use only lowercase letters in a username.

To minimize the risk of failed email delivery to your email address: