Business Leaders

5 Secrets to Write Killer Subject Lines

5 Secrets to Write Killer Subject Lines

5 Secrets to Write Killer Subject Lines

An email subject line is the most important part of any email. It’s equivalent to a newspaper headline, and it tells your audience about what’s in it for them. Your audience depends on the subject line to separate interesting (and important) emails from the spam… and, if they don’t open your emails, you won’t get any sales. In other words, a killer email subject line is the difference between success and failure.

Here you’ll find 5 secrets that allow you to write subject lines that’ll grab the attention of your desired audience:

Know Your Audience

Every successful marketing campaign starts by thoroughly knowing your audience. It’s critically important to know about their needs and desires, what they like, their beliefs… and everything you can find out about your potential customers. Otherwise, you won’t be able to write copy aimed to your prospect’s needs, and nobody in your market will open your emails.

Be Clear and Concise

Always use a clear language and go straight to the point. Don’t use complex words, and never try to be clever (cleverness kills sales and has no place in marketing). Remember that your potential client’s inbox is brimming with all kinds of spam, and he’ll be scanning for an easy-to-understand subject line that says something about his needs. If possible, try to keep your subject line under 50 words, because mobile devices will just cut off your subject lines.

Be Specific & Ask Questions

Being specific adds a lot of credibility to your emails. Instead of saying “How to Lose Weight Now,” you should say “7 Secrets Celebrities Use to Drop 10 Pounds in 28 Days.” Another proven technique is to ask a relevant question in the subject line, such as “Are You Making These 4 Fatal Mistakes in Your Business?”


The late Dale Carnegie, author of How to Win Friends and Influence People (one of the best-selling books of all time), always said that “a person’s name is, to that person, the sweetest and most important sound in any language.” You can take advantage of that and personalize your email subject lines, but don’t abuse.

On the other hand, you can personalize your emails by including location, recent purchases, and other data about your clients you have gathered over time. In fact, you’ve got to use this information to segment your email list, and send personalized emails to everyone in your list. For example, let’s say you sell shoes for women. Over the years, you’ve noticed some women buy a specific type of high heels, while others prefer to buy boots. You can then use this info to send a personalized email telling the women in the first group about your latest sale on high heels, and you’ll get a much better response than if you email your entire list about products they might not be interested in buying.

Avoid Words That Trigger Spam Filters

There are several words that guarantee your emails won’t reach your prospect’s inbox… and instead, they’ll be buried forever in the spam folder (or they’ll reach the “promotions” tab in the best case scenario). Always avoid using the words “free,” “help,” “donate,” “sale,” “% off,” or “cheap.”


Testing your subject lines is the only way to know what really works for your specific audience. An A/B split test will give you all the answers you’re looking for, and it’s the key to truly discover what’s the best kind of subject lines that’ll grab your prospect’s undivided attention.

By applying these secrets, you’ll virtually guarantee your list will open almost any email you send them. However, if you want to take advantage of email marketing services to boost your revenue, then your best option is to contact a proven email marketing agency. Solutions For Growth is the premier email marketing agency specializing in boosting the sales of small businesses with effective email marketing services, and they have the experience and results to prove it. You can talk to one of their marketing specialists at (914) 533-7226.