If you address the other person directly, your email stands out more. You can do this by mentioning the person’s name or by using the words “you” and “your.” These words are direct, conversational, and encourage the recipient to open the email.  For example, start the subject line with a phrase like “Hey Bill!” or “Did you call yet?” If you don’t know the person’s name, you can reference a personal detail like the recipient’s location. For instance, say, “Best restaurants in your city.” It’s important to relay urgency as soon as possible. Encourage the reader to click on the email by including a call to action or a reference to scarcity. These tactics suggest that the reader needs to act right away to benefit from the email.  For instance, use words and phrases like “Hurry!” or “24 hours left” to call the reader to act now. Hint that something is limited, such as by saying, “This item is flying off the shelves.” Follow up the urgent word with a clear picture of what the reader should expect inside the email. Use action-oriented words to suggest how the reader should respond. Make sure you keep the subject line clear and concise so the title isn’t confusing.  For example, you can say something like, “Hurry! It’s a sale.” You can also explain the email through numbers. For instance, say, “5 ways to reduce your electric bill.” A question can be a great way of hinting at what is inside your email. The question has to be relevant to the reader. It should reference an urgent event or a subject the reader needs to know, encouraging them to read the email right away.  For example, you can say something like, “Last chance - have you ordered your tickets yet?” Another example is, “How can you be more productive today?"
Refer to the recipient in your subject line. Use urgent language in the subject line. Hint at what is inside the email. Ask the reader a question for an alternative way to be engaging.