Employing uppercase letters exclusively within electronic mail communication refers to a specific formatting choice. As an example, “PLEASE REVIEW THIS DOCUMENT” demonstrates this technique. The practice alters the visual presentation of text.
This formatting choice can significantly impact the perceived tone and readability of a message. Historically, it has been associated with urgency or emphasis, but overuse can lead to misinterpretation, often being perceived as shouting or expressing anger. Early character-based communication systems sometimes lacked lowercase options, contributing to its initial prevalence, but modern graphical interfaces offer nuanced control over typography.