Yes, email subject lines are typically capitalized. Following standard capitalization rules, the first letter of each word in the subject line is usually capitalized, except for articles (e.g., “a,” “an,” “the”), coordinating conjunctions (e.g., “and,” “but,” “or”), and prepositions (e.g., “in,” “on,” “with”) unless they are the first or last word of the subject line.
For example, a properly capitalized email subject line could be:
“Important Reminder: Meeting Tomorrow at 10 AM”
It’s worth noting that some individuals or organizations may choose to use sentence case (capitalizing only the first letter of the subject line) or alternative capitalization styles for branding or stylistic purposes. However, the standard convention is to capitalize the first letter of each word in the subject line.