If mitochondria are the powerhouse of the cell, then it’s safe to say that subject lines are the powerhouse of the marketing email. Without a good subject line, it might not even matter how impressively designed or immaculately worded your email is. If your reader doesn’t have a reason to open it, then it either goes in the recycling immediately, stays in their inbox for six months until they clean the inbox out, or–worst of all–they report it as spam.
You want your readers to see all the beautiful work you did, right? Of course, you do. Let’s look at a few subject line best practices to make sure your beautiful words and graphics find their way to the eyes of your readers.
Test ‘Em Out
You see us mentioning A/B testing all the time, but it’s important to understand why. If you’re regularly A/B testing your subject lines, then you’re gaining valuable insight into what works and what doesn’t. Without this process, you’re flying blind and hoping for the best, but once you implement it, you’re able to make informed subject line decisions moving forward.
Short and Sweet
When it comes to subject lines, shorter is always going to be better. A huge amount of people use their phones to check their email, which means that if it’s too long, it’s going to be cut off. If that happens, you’re failing to give your reader a reason to open.
Sure, you can make the beginning seem really enticing, but more often than not, the reader will scroll on by. Our recommendation? Keep it around 50-60 characters maximum so your reader sees your whole pitch.
What’s in a Name?
A lot! Familiarity and personalization are key factors in nabbing a reader’s attention. If you already have a prospect’s name, you can use merge tags so that your sends use their name or location! It might not seem like much, but those details stand out and make your messaging seem more pointed and considerate.
Personalization and dynamic content can be used in a variety of ways, and not just in subject lines. Learn more about it here.



