The email subject line is the first segment of an email that influences the open rate. Wrong triggers can land in spam and lessen the campaign response rate.

As per Litmus research, the email subject line is the second most important thing that subscribers prioritize while engaging with unread emails. On the other hand, email subject lines containing discount codes have 8 times more chances of conversion.

This blog post will explain some good and bad email subject lines, best practices, and examples.

Take Away:

“Email subject lines are a vital part of email marketing content strategy. There should be a lot of research, brainstorming, and testing of effective subject lines. It increases the email open rate, which results in more responses and conversions. Best practices include conciseness, relevance, and creativity.”

What is An Email Subject Line?

“It is a crisp summary of an email that shows as a preview in the recipient’s inbox. A subject line is added to draw attention and provide context for the email content. Businesses and brands can use them for their marketing emails.“

The email subject line is a decisive factor that urges people to open emails. Personalized subject lines boost the success rate of an email marketing campaign.

Importance Of Email Subject Lines

Marketers who use interactive email subject lines experienced a 70% higher conversion rate. This highlights their importance in result-oriented campaigns. From grabbing attention to encouraging reader engagement, they play a diverse role.

Recipients love customized subject lines, which leads to a high open rate. Generic email subject lines usually get caught by spam filters. So, they give a first impression of your business to potential customers.

How To Write Effective Email Subject Lines?

Writing a good email subject line is similar to an exclusive artwork placed in a gallery that attracts visitors. Exceptional copywriting skills and brand understanding are the must-have ingredients. Here are some tips that can help you create yours.

Purpose of Emailing

Why do you want to reach out to that person? Clarify your objectives and email marketing goals, and summarize them with a crisp subject line that will hint to recipients about the reason for receiving your email.

Use a Conversational Tone

Consider your recipients as humans like you. Use a simple and conversational tone that will result in a positive response. Readability shouldn’t be compromised while writing a marketing or business communication email subject line.

Ask Questions

Asking quick questions in the email subject is way better than a generic text for engagement. It increases the email open and response rates, which are key metrics of a successful email marketing campaign. Here are some examples:

Is this possible?
Your thoughts?
Meeting today?

Give Humoristic Touch

Adding humor to the email subject can be a good idea. The fun aspect is a common practice by prominent brands to get engagement.

Brainstorm some creative words and phrases to stand out from the crowd. We have shared some funny email subject line examples below.

Comprise A Call To Action

A call to action in the email subject line influences recipients in quick decision-making. The odds of email opening increase if a solid CTA is specified.

There should be an ultimate incentive for a call to action, like grabbing a 20% discount on a premium plan, a 7-day free trial, etc.

100 best email Subject lines That Work

Catchy email subject lines with a sense of urgency usually bring more returns as compared to generic ones. Here are some examples of email subject lines you can consider and customize for your campaign.

B2B Email Subject Lines

B2B marketing teams and management teams experience a massive influx of cold emails. They don’t pay attention to subject lines with ordinary or generic offers. You need to craft a good email subject line for more activity.

Depending on the objectives, we have got a few examples of B2B email subject lines that can help you get enhanced email marketing ROI.

Boost Your Team’s Productivity with Trello Boards (Trello)
Streamline Your Workflow with Monday.com’s Automation Tools (Monday.com)
Transform Your Meetings with Zoom’s New Integrations (Zoom)
Maximize Your ROI with Our CRM Solution (Salesforce)
Simplify Team Collaboration with Slack’s Latest Features (Slack)

Email Subject Lines For Introduction

A solid introductory email is vital for establishing positive professional or business communication. It can include a concise and engaging product, service, or business intro.

Such emails aim to encourage recipients to learn more with a clear call to action while setting the business tone. Here are some examples of introductory emails.

Welcome to Dropbox—Let’s Make Collaboration Easier (Dropbox)
Let’s Create Something Amazing—Welcome to Canva! (Canva)
Say Hello to Zoom—Ready for Your First Virtual Meeting? (Zoom)
Welcome to Asana! Let’s Get Started with Your First Project (Asana)
Let Us Introduce You to the Future of CRM (Salesforce)

Follow-Up Email Subject Lines

Reminders are important for the enhanced reply rate of an email marketing campaign. 3 follow-ups are a must for a marketing email, especially the cold ones. Follow-up emails aim to receive a response and initiate a conversation.

Such subject lines are usually polite, professional, and conversational. The objective is to get a reply without pushing too much. Here are some examples of follow-up email subject lines.

Following up—Are you ready to streamline your accounting? (QuickBooks)
Reminder: Your document is waiting for signature (DocuSign)
Still interested in boosting your team’s productivity? (Slack)
We’re still here to help—Ready to take the next step? (Shopify)
Just wanted to check in—Need help with your projects? (Asana)
Circling back on your demo—Any questions? (Zoom)
Have you had time to explore these networking opportunities? (LinkedIn)
Following up on our conversation from last week (Salesforce)
Just checking in—Did you have a chance to review it? (HubSpot)

Funny Email Subject Lines

Adding a fun element is a good email copywriting practice. Creativity in your email subject lines carries the best outcomes. It sometimes works as an icebreaker and leaves a lasting impression on the readers.

Humor-based email subjects include playful language, clever twists, and puns. Here are a few examples for better understanding.

Just gonna leave this here… 😏 (Revolve)
Your dog told us to email you (BarkBox)
Licking your phone never tasted so good (OpenTable)
Where to Drink Beer Right Now (Sent by a bot, obviously) (The Hustle)
Lookin’ sharp! But not like, too sharp… (Warby Parker)
Deals that make us proud (unlike our nephew, Steve) (Groupon)
Pairs nicely with awkward family dinners (Urban Outfitters)
Do You Even Shave, Bro? (Dollar Shave Club)

Catchy subject Lines for Business emails

Catchy email subject lines are created to grab the recipient’s attention and increase the open rate. They are benefit-focused, concise, and action-oriented for maximum campaign impact.

Such emails usually highlight value, a sense of urgency, and relevance that is worth the reader’s time. Here are a few examples of catchy email subject lines for business emails.

Simplify Your Accounting with QuickBooks—Start Today! (QuickBooks)
Improve Your Meetings with These Zoom Features (Zoom)
Unlock Productivity with Microsoft Teams (Microsoft)
Steal these email templates (Digital Marketer)
Turn Your Emails into Revenue—Learn How (Mailchimp)
Instagram Contest — Enter for Your Chance to Win (NameCheap)
Discover the Power of Automation in Sales (Salesforce)

Meeting Request Email Subject Lines

Such emails come around a single objective, like meeting scheduling, follow-up, and feedback. Meeting subject lines are straightforward and deliver a sense of urgency. They can happen between team members, clients, and interviewers.

They cover a specific time frame and aim for prompt response. Here are some examples of meeting request email subject lines.

Reminder: Your meeting with [Name] is tomorrow at 10 AM (Calendly)
Your Zoom meeting invitation—Join us tomorrow (Zoom)
Join us for a meeting on product updates (Microsoft Teams)
Meeting confirmation: Your demo is scheduled for Tuesday (Salesforce)
Let’s discuss next quarter’s strategy—Meeting invite (Google)

Survey Email Subject Lines

Survey emails are intended to encourage their subscribers and customers to participate in different brand surveys. They are mainly seeking first-hand feedback and opinions. Subject lines of survey emails usually highlight their importance and rewards for the valuable time.

For maximum input, there should be recognition of recipients’ valuable time spent on the survey. Here are a few examples of survey email subject lines for better understanding.

How was your ride? Share your experience (Uber)
Help us improve your experience—Share your thoughts! (Airbnb)
We want to hear from you—Complete this short survey (LinkedIn)
We value your feedback—Take a few moments to tell us how we’re doing (PayPal)
Your opinion counts—Take our survey and help us improve (HubSpot)
What do you think? Take our survey and let us know! (Spotify)
Got a minute? We’d love to hear your feedback (Dropbox)

Thank You Email Subject Lines

Thank you emails are triggered for appreciation and showing gratitude. They are warm, concise, and hold acknowledgment. Such emails are sent after successful participation in events, meetings, and newsletter sign-ups.

The purpose of thank-you emails is to acknowledge the recipient’s contribution and nurture a positive relationship. Here are some practical examples of thank-you email subject lines.

We appreciate your business—Thank you for choosing Shopify (Shopify)
Thanks for riding with us—How was your experience? (Uber)
Thank you for your feedback—We appreciate your input (Salesforce)
Thank you for your purchase—Your order is on its way (Amazon)
Thank you for joining our webinar! (HubSpot)

FOMO email Subject lines

SaaS and e-commerce businesses widely use fear of missing out in email subject lines. They offer limited-time discounts, free trials, and other perks to their subscribers. The element of scarcity encourages them to open up and take action.

FOMO emails are intended to maximize the email open rate and sales. Here are a few examples of such email subject lines from businesses.

Last chance to book your summer getaway ☀️ (Airbnb)
Only a few hours left to grab these deals! (Amazon)
Hurry, a limited-time offer on your favorite gadgets! (Apple)
Don’t miss out—Only a few pairs left in your size! (Nike)
Uh-oh, your prescription is expiring. (Warby Parker)
Your exclusive offer ends soon—Get Premium now! (Spotify)
Don’t miss out—Your $10 ride credit expires soon! (Uber)
Going, going… gone! Last chance to shop! (Sephora)
Final call: Sale ends tonight! (Best Buy)
Tonight only: A denim lover’s dream (Guess)
Tickets almost gone—Secure your spot now! (Eventbrite)
Instagram Contest — Enter for Your Chance to Win (NameCheap)

Retargeting Email Subject Lines

Retargeting emails are focused on users who have shown interest in any product or service but failed to complete any action. It can be an abandoned cart, a free trial sign-up, or a purchase attempt.

These emails are used to remind recipients of the importance of the pending action. The goal is to return recipients and subscribers to the action page for the completion of the sales process. Here are a few retargeting email subject lines to learn more.

Don’t miss out on your perfect stay—Book now! (Airbnb)
You left something behind—Come back to finish your order (Sephora)
The price dropped for something in your cart (Target)
Your cart is still here—Snag your gear before it’s gone! (Nike)
Did you miss out on some of these new features? (Animoto)
Come back—Your favorite products are still in stock! (Shopify)
Uh-oh, you forgot something! Finish checking out now (ASOS)

Email Subject Lines for Friends

Emails to friends are mostly casual and based on personal relationships. They can have fun elements, inside jokes, and humor in their subject lines. Unlike business communication, email subject lines for friends carry excitement, conversational, and informal content.

They are usually straightforward with minimal complexity. Here are a few subject line examples for friends.

Game night at my place—You in? (David)
Got time for a quick chat? Big news! (Ben)
Let’s talk—It’s been way too long! (Katie)
Guess who’s moving back to town? (Jake)
I found the perfect meme for you 😂 (Mike)
Can we finally catch up this weekend? (John)

Personal Email Subject Line Examples

Personal emails typically reflect the relationship between the sender and the recipient. It can be anyone: a family member, a friend, or a colleague. Their warm and familiar tone intends to start the conversation on a specific subject.

Such email subject lines can be anything like personal advice, life updates, and simply to keep in touch. Here are some examples of the most commonly used personal email subject lines.

Check this out—You’ll love it! (Dad)
Guess what I found from our high school days? (Jack)
You free for lunch this week? (Michael)
Here’s that book I told you about! (Sarah)
Let’s plan a weekend trip—It’s been too long! (Mark)
Can we catch up soon? I miss our chats. (Emma)
Don’t forget to call me! ❤️ (Mom)
I need your advice on something important (Alex)

Best Practices For Email Subject Lines

An email subject line is considered a decisive factor in the email marketing campaign success. It gives recipients a valid reason to read the email content. Descriptive and personalized email subject lines grab the attention of the recipients.

Realizing its importance, here are some best practices for email subject lines every marketer should consider.

Use Concise Subject Lines

The majority of email readers use mobile devices to read their emails. Due to screen size limitations, it is necessary to keep subject lines concise to make them mobile-friendly.

Keep them under 10 words and 60 characters, as long subject lines have a lower email open rate. So clearly define your limitations to the copywriting team.

consider a/b Testing

Create multiple subject lines for A/B testing the best-performing ones. The prime objective of the email subject line is to get a better open rate. By using this method, you can identify the right way to scale your business with email marketing.

Add some Emojis

A relevant emoji in the email subject line makes it visually engaging. But there shouldn’t be more than one at a time. Emojis should be added to supplement the keywords instead of replacing them. Test them for different operating systems, as they render different versions according to their system’s ability.

Restrict the Punctuations

Excessive use of punctuation in email subject lines can land your emails in spam. So there should be a maximum limit of 3 punctuation marks per subject line to achieve the highest inbox delivery and open rate.

Curiosity Element

Adding the curiosity element in email subject lines increases the chances of clicking. Such words or phrases influence recipients and encourage them to take action. Maybe just to check what is inside!

Use it on a limited scale on specific occasions and avoid overdoing. This should be done if there is real value for the recipients in the email content.

Sense Of Urgency

This technique also works for time-bound offers, discounts, and sales. Adding a sense of urgency in the subject line compels the recipient to take advantage. Use this kind of subject line during Cyber Monday, Black Friday, and other distinctive occasions.

Things To Avoid In Email Subject Lines

Adding unnecessary words, emojis, and phrases can ruin the context of your email subject line. Here are a few common mistakes you should avoid.

Avoid Question Marks or Exclamations at The Same Time

Web servers flag emails as spam if they use question marks and exclamations in the same subject line. This can also lead to confusing actions in the recipient’s mind.

Example: “Did you forget something? Act now before it’s too late!”

Instead of the above subject line, which may trigger spam, use this sample: “Limited time offer—Don’t miss out!”

Be careful With Spam Traps

Things like weird spaces, special fonts, emojis, and characters are harmful elements. These traps activate the spam triggers that destroy your email delivery and open rate. It can affect the credibility of all business emails with your domain name.

Don’t Use All Caps Letters in Email Subject Lines

The use of caps in the whole subject line is considered a flawed practice. Because it is bad for both deliverability and user experience. Recipients consider such emails spam and ignore them.

Example: Your Exclusive Black Friday Offer Is Inside!

Frequently Asked Questions

What is a good open rate for email subject lines?

A good average open rate is 35–45% across most industries, with top performers exceeding 50%. If your open rates are consistently below 20%, your subject lines (or list quality) need work.

How long should an email subject line be?

Keep subject lines between 30–50 characters (roughly 6–10 words) for best results. Shorter subject lines display fully on mobile devices, where most emails are now opened.

What words should you avoid in email subject lines?

Avoid spam triggers like “free,” “guarantee,” “no risk,” excessive exclamation marks, and ALL CAPS. These increase the chance your email lands in the spam folder instead of the inbox.

Do emojis in subject lines improve open rates?

Emojis can lift open rates by 10–15% when used sparingly and relevantly, especially in B2C emails. Use one emoji max, place it at the start or end, and always test; they can look unprofessional in formal B2B contexts.

Wrap Up

No opens mean no reply, which puts all your marketing efforts in vain. The email subject acts as the first step towards the success of an email marketing campaign.

Readers love personalized emails, so be adaptive and use AI tools for bulk personalization. Use A/B testing with different styling options, formats, and lengths. Shorter subject lines perform better due to clear visibility across devices.