Email addresses, used for sending and receiving electronic messages, follow a specific format. A standard email address consists of a local part (the username) and a domain part, separated by the “@” symbol. For example, in “example@domain.com”, “example” is the local part and “domain.com” is the domain part.
Historically, the technical specifications for email addresses, as defined by Internet standards, allowed for the use of uppercase and lowercase letters. However, despite this allowance, the practice evolved towards case-insensitivity. This means that while technically permissible, the functional interpretation of email addresses disregards letter case distinctions. This approach simplifies address management and reduces potential user error.