To make urgent emails effective, follow these guidelines: - Clear Subject Line: Make the urgency clear right from the subject. For example, "Important: Action Required to Secure Your Account". - Concise Content: Get to the point quickly. Use bullet points and short paragraphs. - Strong Call to Action (CTA): Clearly state what the recipient needs to do and by when. - Personalization: Personalize the email to make it more relevant and engaging.