Did you know that effective email subject lines plays crucial part in every email you send to your prospect? Your recipients are expected to check the subject lines first whether they will open the email or not. Want to improve your ability to write effective email subject lines? Here are 16 Tips to write killer email subject line in 2023. These tips will help you achieve your response goals.

In this detailed guide of writing the best email subject lines, we are helping you to understand that what will help you to increase your open rates.

What Is An Email Subject Line?

The email subject line is a line that users see in their email inbox that gives a hint as to what the email is about is called the subject line. This one line of content frequently affects whether a reader will fully open your email to read it or will simply delete it.

Generate more qualified leads with cold outreach!

Why A Good Email Subject Line is Important.

47% of email readers just read the subject line before opening the message. The subject line alone is all that 69% of email receivers use to determine whether an email is spam.

In other words, the success or failure of your email marketing efforts depends on the strength of your subject lines.

The ideal way to compose email subject lines is to appeal to the reader’s natural impulses and psychological precepts in order to persuade them to open the email. This will increase opens and decrease the likelihood that the email will be labeled as spam.

16 Tips to Write a Killer Email Subject Line

The first thing that catches the recipients’ attention in an email is the subject line. It frequently becomes the determining factor in whether or not emails are opened. Always write a strong and compelling subject line for your emails. Emails without a subject line are either deleted or ignored.

The recipients are more likely to open an email with a compelling subject line. It aids in catching the recipient’s attention and convincing him to open the mail provided. A few suggestions for creating a compelling subject line are provided below, along with the best email subject line examples. (Additional advice to improve your email opening rate is provided here.)

1. It ought to Be Chosen as the Initial consideration

Subject lines frequently receive little attention. It is written after the email body is prepared to be sent. One of the worst mistakes a person can make is this. We are all aware that first impressions are lasting. Additionally, the subject line of your email is the first thing that recipients see. It must be given consideration, and the first line should be written.

2. Make the Subject Line unique

A unique subject line is always more intriguing. The beneficiaries feel as though they are receiving personal attention. One must send identical emails to various recipients while sending emails on behalf of a corporation. Each receiver should have a unique subject line that conveys the idea that the mail was specifically written for them.

It is recommended to mention the recipient’s name in the subject line—either first or last name. It’s also a good idea to include the recipient’s city name.

Example : “Happy Birthday Lindsay! Surprise Inside”

3. Shorter Is preferable

Subscribers can quickly scan short subject lines. Additionally, smartphones are becoming the most popular way to read emails. On a mobile device, short subject lines are easier to read.

4. Make It educational

The subject line should be able to give the recipients a hint about the email’s content. This will enable the subscribers to make informed decisions and assess whether the mail meets their needs. When recipients make assumptions, it irritates them, and eventually they start to ignore your emails.

Example : “11 Mind-Blowing Copywriting Hacks To Improve Your Website”

5. New Topic Lines Can Be influential

When the subject line is the same every time, people become bored. Make it a habit to always send new emails with a new subject line.

The best example to use to illustrate this is a newsletter. When the first few emails are sent, the opening rate is high, but it tends to drop with time. The fact that the same subject line is consistently used is the main factor. Every time, create a different subject line and mention a few things in the newsletter.

Example : Avoid the “This Week Newsletter from SendBuzz.”

6. Create interest

The subject line should be intriguing enough to pique the recipients’ interest. They ought to find it intriguing, leading them to want to learn more about the mail.

Even though it should give a general notion of the mail’s contents, the complete contents shouldn’t be revealed. The recipients should be intrigued and want to read the entire email.

Example : “10% inflation spike”

7. The Subject Should Give Priority to Significant words

Every day, every one of us must sort through a large number of emails. We scarcely give the letter a second or two of thought before opening it. Include key terms describing the email’s topic in the subject line.

Almost 55% of editors who responded to the poll on guest posts and pitches mentioned that they prefer emails concerning guest blogging to have simple subject lines like “Guest post proposal” or something similar. They will open the email because they immediately understand what it is about.

8. Filler Words Must Be removed.

In the subject line, avoid using terms like “um,” “uh,” “er,” “ah,” “like,” “okay,” and “right”. Every word counts because the subject lines must be brief. Additionally, filters may send your email to the spam folder if the these kinds of filers are present in the email.

Example : “Your prescription is about to expire.”

9. Keep It Easy

Subject lines with few words are always praised. The recipients will find it simple to read and understand. Making it poetic won’t work in your favour.

10. Include Logical keywords.

The recipients frequently don’t immediately check their mail after receiving it. They regularly organise their mail into folders and then review it. When necessary, searching for emails is facilitated by logical keywords that are connected to the emails’ topics.

Example : “Follow up on the SendBuzz Proposal.”

11. Cite Your Sources

It is always a good idea to list the name of the person or business that referred you in the subject line. It aids in capturing the recipient’s interest. It is frequently set aside for the email’s content. The topic line should, however, also contain it.

Example : “[Referral name] led me to you.”

12. Benefits to Recipients May Be Listed

The benefits to the recipients listed in the subject line serve as a hook to get them to open your mail. It is usually advisable to highlight any discounts or opportunities that have been sent to you in the subject line. The percentage of the discount might be indicated on the subject of any offer or discount.

13. Indicate Whether a Response Is Expected

It is best to indicate in the subject line whether a response is expected. You can add words and phrases to the subject line, such as “please reply,” “your thoughts are greatly valued on [this issue],” etc.

14. You Can Provide a deadline

You can specify the due date by writing “Please respond by [day or date]”. This will indicate to the receiver how quickly they must respond. This works effectively for lengthy emails because the receiver must read the entire email before the deadline. Government agencies adhere to this practise.

Example : “Please submit your tax information before June 1 to avoid fines.”

15. Avoid Asking Questions That You Will Receive the Answers to in the mail.

It is not acceptable to ask a question in the subject line and have the answer appear anywhere in the mail. This forces the recipients of your letter to open it, which is obviously different from what your emails should be intended to do. Instead, your recipients should look forward to opening their correspondence.

16. Avoid using all caps for subject lines.

Although they draw attention quickly and easily, it’s best to avoid using all capital letters. It is thought to be yelling at your readers in a written communication; certainly, it is not your motto.


Top Email Subject Line Keywords :

  • “Upgrade”
  • “Just”
  • “Content”
  • “Go”
  • “Wonderful”
  • “Jokes”
  • “Promotional”
  • “Congratulations”
  • “Revision”
  • “Forecast”
  • “Snapshot”
  • “Token”
  • “Voluntary”
  • “Monthly”
  • “Deduction”
  • “Free”
  • “ICYMI”
  • “$ today, $$$ tomorrow”
  • “Free delivery”
  • “Available”
  • “New”
  • “Alert”
  • “News”
  • “Update”
  • “Weekend”
  • “Thank you”
  • “Monthly”
  • “Bulletin”
  • “Golden”
  • “iPhone”
  • “Breaking”
  • “Order today”
  • “Introducing”
  • “Celebrate”
  • “Buy”
  • “Continues”
  • “Get your”
  • “What…?”
  • “Won’t…?”
  • “Do…?”
  • “Can…?”
  • “May…?”
  • “On orders over”
  • “Orders over”
  • “Off selected”
  • “Your next order”
  • “Available”
  • “Brand new”
  • “Latest”
  • “Special”
  • “Wonderful”

SPAM Triggering Words to Discover

While you might want to include amazing words in your email subject line that captures attention from your recipient as quickly as possible. Though, there are some spam triggering words that might end up sending your emails to promotions or SPAM box. These are :

  1. #1
  2. 100% more
  3. 100% free
  4. 100% satisfied
  5. Additional income
  6. Be your own boss
  7. Best price
  8. Big bucks

Want to grow your outreach? Try SendBuzz today!

Conclusion :

For the maximum open rates possible, keep these suggestions in mind when picking a subject line at random. Most email opens occur on mobile devices. Whichever of the aforementioned methods you choose to employ, be sure your subject line is mobile-friendly.