The practice of using upper and lower case letters in email headings affects readability and can influence recipient perception. A typical example involves adhering to sentence case, where only the first word and proper nouns are capitalized, as opposed to capitalizing every word.
Employing effective capitalization contributes to enhanced open rates by creating a professional and trustworthy impression. Historically, standards have evolved from often employing all-caps for emphasis to a more nuanced approach that prioritizes clarity and avoids being perceived as spam.