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This term occupies a unique space between formal business communication and casual personal correspondence. It carries a connotation of efficiency and speed, replacing the physical tactile nature of traditional mail with an instantaneous, screen-based interaction. While it can be used in professional settings, it is perceived as less formal than a printed letter but more structured than a text message or an instant message. The feeling associated with it is often one of administrative necessity or a digital paper trail.
Countable when referring to a single digital message. Uncountable when referring to the general system or medium of electronic communication.