Subject line is like the first impression you make. And like with first impression, you do not get a second chance. Your email either appeals to the recipient or not. They find it interesting and open it to learn more or trash it. You have that brief moment, that glance to make things right or to fail miserably. It is good to make good first impressions. You may not want to judge a book by its cover but it certainly is true that most people judge an email by its subject line. Especially if they do not know you and you are a mailbox stranger to them. Use those 5 tips to be better at writing subject lines and get straight to their heart and not straight to their trash.