Transactional emails are critical to business apps' success, sharing important alerts and valuable information with customers. With a higher open rate than marketing emails, transactional emails provide an opportunity to upsell, retain, and engage customers who already use services. A good transactional email template should include strong metadata, clear subject lines, preheaders, personalization, and a well-structured message that guides the reader from top to bottom. The design and content should capitalize on the reader's attention, leveraging graphics and creative design to convey the brand identity. Templates should be reusable, customizable with brands, and include multiple variables for personalization. A good template should also cater for consistent rendering across mobile devices and email clients. Everyday use cases for transactional emails include account creation, welcome emails, ecommerce messages, confirmations, reminders, proactive support, and workflow messages. Examples of effective transactional emails include welcome emails from Asana, shipping confirmation emails from Tradesy, reminder emails from Fullscript, invitation requests from Twist, email verification emails from Republic, and workflow notifications from DocuSign. Transactional email templates can be created with tools like Courier's notification design studio, empowering teams to quickly create on-brand, engaging templates that meet the needs of customers.