What uniquely identifies electronic mail communication?

The unique identifier for electronic mail communication is the e-mail address. An e-mail address serves as a specific identifier that allows messages to be sent and received over the internet, directing communications to an exact user or account. Each e-mail address consists of a local part (which typically represents the user) and a domain part (which indicates the mail server), forming a complete address that distinguishes it from all other addresses.

While other options may appear relevant in certain contexts, they do not have the functionality or specificity of an e-mail address for electronic mail communication. A mail code is generally used for postal addresses, a digital identifier may refer to various forms of identification in the digital space but is not specific to e-mail, and a contact number pertains to telephonic communication, rather than electronic mail. E-mail addresses are essential for ensuring that messages arrive at the intended recipient’s inbox, making them the clear choice for uniquely identifying e-mail communication.