Email addresses are identifiers used to send and receive electronic mail messages across networks. A standard email address consists of a local part, an “@” symbol, and a domain name. For example, in the address “example@domain.com,” “example” is the local part, and “domain.com” is the domain name.
The use of case sensitivity in email addresses has been a point of technical specification and practical application. Historically, the domain name part of an email address has been case-insensitive, meaning “domain.com” is treated the same as “DOMAIN.COM.” However, the local part’s case sensitivity has been subject to varying interpretations and server implementations. This distinction is crucial for consistent email delivery and management.