As of 2020, we have four billion email users worldwide, and this number is expected to grow exponentially. This is extremely important for both new and established businesses as email marketing is one of the most lucrative marketing channels if utilized to its full potential.

But then, no matter how great your emails are, the open rates often disappoint. Of course, many aspects of email marketing strategies contribute to that, but one of the essential factors of any email is its subject line. Email marketing campaigns rely heavily on effective email subject lines to drive engagement and conversions. A good subject line can be the difference between a successful email marketing campaign and one that falls flat.

If you are struggling, and need to learn ways to increase your email open rates by optimizing good subject lines for emails, continue reading this article as we have compiled all you need to know right here!

So let’s begin:

What Exactly is a “Good” Email Open Rate?

Before we dive further into the article, let’s first talk about the right email open rates.

Email open rate

The definition of a good email open rate varies depending on various factors, such as the industry, target audience, and type of email. Generally speaking, a good email open rate is considered to be anywhere from 20% to 30%.

However, it’s important to note that open rates can vary widely depending on specific circumstances and factors, such as the subject line, the sender’s reputation, and the email’s relevance to the recipient.

Some industries and audiences may have higher average open rates, while others may have lower ones. Additionally, open rates for one-time campaigns may differ from those of ongoing email campaigns for a subscriber list.

To maximize the chances of success, it’s important to focus on delivering high-quality, relevant content based on subject lines that engage and resonate with the target audience.

The Relationship Between Subject Lines and Email Open Rates

The relationship between email subject lines and open rates is strong, as the subject line is often the first thing a recipient sees and is what determines whether or not they will open the email.

A well-crafted subject line can entice the recipient to open the email, while a poorly written one can lead to the email being ignored or deleted. Subject lines play a critical role in determining the success of an email marketing strategy. They are the first thing that the recipient sees and can either entice them to open the email or turn them off.

An effective subject line should be concise, relevant, and attention-grabbing. It should clearly communicate the purpose of the email and give the recipient a reason to open it.

By testing different subject lines and paying attention to the results, marketers can determine what works best for their specific audience and continually optimize their subject lines for higher open rates.

The Science Behind Email Subject Lines

When it comes to email subject lines, it is all about understanding the psychology of the recipient and using it to create a compelling and attention-grabbing subject line. The reason is, email subject lines play a critical role in determining whether an email will be opened or ignored.

Science behind email subject lines

Therefore, an effective email subject line should be short, specific, and provide a clear benefit to the recipient. It should also avoid using spam trigger words and be optimized for the recipient’s email client and devices.

Of course, if you don’t already have a list, you can scrape emails from Facebook, find emails from LinkedIn, or better yet, use an effective email scraping tool such as Leads API to help you.

Best Practices for Crafting Email Subject Lines

As discussed earlier, the subject line is critical in determining whether an email will be opened or ignored. While a compelling subject line can increase the open rate, a vague or uninteresting subject line can decrease it. So, after you find email addresses and compile your list, try some best practices for crafting effective email subject lines:

  • Keep it Short: Aim for around 6 to 10 words. A short, concise subject line is more likely to grab the recipient’s attention and be remembered.
  • Be Clear and Direct: The subject line should accurately reflect the content of the email. This helps the recipient understand what they can expect in the email and whether it’s relevant to them.
  • Personalize: Make the subject line relevant to the recipient and include their name or other personal information to make it feel more personal and increase the likelihood of them opening it.
  • Use Clear and Concise Language: Avoid using technical jargon or complicated language; instead, use clear and concise language that clearly conveys the purpose of the email.
  • Use Keywords: Including relevant keywords in the subject line can help the email get noticed, especially if the recipient uses an email client with a search function.
  • Create Urgency: Use language that creates a sense of urgency or scarcity, such as “limited time offer” or “last chance.” This can encourage the recipient to open the email right away.
  • Make It Actionable: Use action-oriented language, such as “register now” or “download today,” to clarify what the recipient should do after opening the email.
  • Test and Refine: Test different subject line formats and wording to see what resonates best with your audience. Use this information to refine and improve your subject lines over time.

Remember, the subject line is the first thing the recipient sees, so it’s important to make a strong impression and get them to open your email. Also end the email with a professional signature and company contact details for authenticity.

Top 06 Examples of High-Performing Email Subject Lines

Now that we have discussed how crucial email subject lines are, and what practices you can use to make your subject lines stand out, let’s discuss 06 of the most professional email subject line examples:

  • Urgency and Exclusivity: Offers that include the keywords “don’t miss out” or “exclusive offer” create a sense of exclusivity and urgency, encouraging the recipient to open the email and take advantage of the offer before it’s too late.
  • Discount/ Promotion: A limited-time offer creates a sense of urgency and exclusivity by highlighting that the offer is limited and will only be available for a certain period of time.
  • Important Update: Using the keywords such as “urgent” or “important update” lets the recipient know that the information contained in the email is important and requires their immediate attention.
  • Insights: In the world of outbound prospecting, quoting information or insights from industry experts is also intriguing as it promises valuable information from a respected industry expert or thought leader.
  • Tips and Tricks: This type of subject line is specific and actionable, promising a certain number of tips or tricks for achieving a certain goal or outcome.
  • Congratulatory: Last but not the least, using “congratulations!” or achievement-related keywords in your subject lines is personal and celebratory. They are one of the best personal email subject line examples as they recognize the recipient’s achievements and make them feel valued.

Here are some email subject lines you can use:

  • Hey, you forgot this ____ Enjoy your 20% off!
  • Reduce your marketing work by 35%!
  • One Week LEFT: Grab Your Free Trial Now!
  • Let’s Talk Numbers, Jane
  • Free resources to help you with X!

Email Extraction Made Easy with Tools!

Now, you have some great practices and examples of high-performing email subject lines, but what if you are stuck at the very start? What if you are struggling with compiling an effective email list to share those quality emails with?

CrawlBase’s Leads API is a company email extractor tool. It allows users to extract the email addresses from websites and store them in a database. The API can be integrated into existing applications to automate the process of collecting leads, reducing the time and effort required to manually search and compile a list of contacts.

This tool is intended to be used for sales and marketing purposes, helping organizations reach out to potential customers and clients.

So whether you are setting foot into the world of cold emailing or are already aware of your exact clientele, Leads API can be of help. The best part? It helps resolve any and all transactional email problems before they even reach you.


Every business wants clicks. But without email rates, no traffic moves to your website, and all effort goes to vain. But hey, there’s a solution to this problem; effective email subject lines!

Of course, email subject lines are a critical component of any email, as they can impact the recipient’s decision to open or ignore the email. It’s important to invest time and effort into crafting strong, effective subject lines that accurately reflect the content of the email.

We have shared some professional email subject line examples to help you craft optimized options tailored to your business needs. So go through the article and help yourselves.