The subject line has always been a pretty important element to email communications. After all, if your subject is not relevant and does not catch the recipient’s interest, the likelihood of them opening your message decreases. Sender reputation plays a huge part in this, but let’s focus on the subject line.

In most of our studies, we see the open rate increase with shorter subject lines. Across a large sample, our highest open rates were with subjects that had fewer than 39 characters, but there are exceptions to the rule which makes it very important to test. In a post from early 2009, I wrote about A/B Subject Line Testing. While this plays an increasingly important role as your list size grows, it can also help to make big improvement for small senders.

Quick Tips for Subject Lines:

1. Be Cognizant of Inbox Restraints: some email clients will not display your entire subject, so make sure to have your key points at the front.

2. Focus on Targeted Copy: more important than the length is what your subject says. If it is timely and targeted you will see higher engagement rates.

3. Explore Dynamic Subjects: If your email platform supports dynamic content, experiment with using dynamic elements in your subject.

4. Test: The A/B approach helps increase your email funnel for each send and provide good data for future improvements. Take the extra step and test your subject lines.