50 email subject lines that get opened
TL;DR, the essentials
- The email subject line is the first thing your recipient sees, and it alone decides whether the message gets opened or ignored.
- A strong subject line pulls on six levers: curiosity, benefit, urgency, personalisation, controlled length and emojis used sparingly.
- Below, 50 sorted examples by category (promo, content, re-engagement, event) to adapt and A/B test on your own list.
You can spend hours polishing your newsletter, but if the subject line does not earn the click, nobody reads the rest. An email subject line is your shop window inside a crowded inbox. Here is how to build one, with 50 email subject lines ready to copy and adapt to your audience.
Why is the email subject line so decisive?
Inside an inbox, your message competes for attention against dozens of others. The reader sees only three things before deciding whether to open: the sender name, the subject line and, sometimes, the preheader text (the preview that follows the subject). The subject line therefore carries most of the promise.
In practice, it is the single biggest driver of your open rate. Two subject lines on the same content can produce wide gaps in opens, which is exactly why most platforms offer a dedicated A/B test for the subject. One caveat: since Apple Mail Privacy Protection, a share of opens is counted automatically, which inflates the metric. We cover this in our article on email open rate. The safe practice is to steer by clicks as much as by opens.
In one sentence
The subject line does not sell your product, it sells the open. Its only job is to make the reader curious enough to click.
What are the 6 principles of a good subject line?
Before the examples, here is the framework. An effective subject line activates at least one of these levers, rarely all six at once. Use them as a toolbox, not a rigid recipe.
Curiosity
Open a loop that only the click can close. A question, an intriguing number or a partial fact makes readers want more. The trap is clickbait: the promise in the subject must be kept inside the email, or you break trust and your next send gets ignored.
Benefit
Say clearly what the reader gains. “Save 2 hours a week on invoicing” beats “Our new feature”. Do not talk about yourself, talk about the outcome for the recipient.
Urgency and scarcity
A deadline, low stock or an offer that is ending nudges people to act now rather than “later”, which usually means never. Use it with restraint: urgency on every send stops being believable.
Personalisation
The first name is a classic, but real personalisation goes further: segment, purchase history, city, recent behaviour. A subject that reflects what the person did or likes grabs more attention than a bolted-on “Hi {first name}”.
Controlled length
On mobile, a large share of long subjects gets truncated. Aim for 30 to 50 characters, or 6 to 9 words, and put the strong information first. The preheader picks up the slack to complete the promise.
Emojis, sparingly
One well-placed emoji catches the eye and humanises the subject. Two or three become noise and can hurt deliverability with some filters. Simple rule: one emoji at most, and only if it adds meaning.
Good habit
Never write the subject line last, in a rush. Draft three versions up front, then A/B test two of them on a sample of your list before the full send.
15 promotional subject lines that drive sales
The flagship category for e-commerce. The goal is to create desire and a little urgency, without shouting “SALE” in caps on every send.
- Your 20% off code expires tonight at midnight
- {First name}, we put your favourites on sale
- 3 days, 3 offers, don’t miss out
- The price just dropped, hurry 🔥
- Last units left in stock
- Open up, your discount is inside
- Just for you: 30% off this weekend
- The private sale starts now
- Now or never (48-hour offer)
- We’re doubling your loyalty points today
- Free shipping, only a few hours left
- Your cart is waiting, 15% cheaper
- New price on your essentials
- Surprise gift on orders over £50
- The countdown has started ⏳
You still need the right tool to send
A great subject line means nothing without a platform that delivers. Our comparison ranks the best email marketing software for 2026.
13 content and newsletter subject lines
No promo here, just value. You lean on curiosity and practical benefit to make readers want to open an article, a guide or a tip.
- The method we wish we’d known sooner
- 3 mistakes hurting your sales (and how to fix them)
- What nobody tells you about {topic}
- Your weekly recap in 5 minutes
- We tested it, here’s the verdict
- The full guide is finally here
- One simple trick to save time
- Why your competitors do this (and you don’t)
- The number that will surprise you
- 5 ideas to steal this week
- Our pick of the month
- The question everyone asks us
- Read this before Monday
Beware of clickbait
A subject that promises a secret or a shocking number must deliver from the first lines of the email. Misleading subjects lift opens once, then collapse trust and drive up unsubscribes.
12 re-engagement subject lines that win the reader back
Abandoned cart, silent prospect, inactive contact: the follow-up is often the most profitable message in a sequence. The subject should remind readers of the value without guilt-tripping them. These same mechanics show up in outreach too, see our guide on cold email.
- You forgot something 👀
- {First name}, your cart is about to expire
- We’ll hold your selection for another 24 hours
- Still interested in {product}?
- One last thing before we go
- It’s been a while, did we lose you?
- Your discount is still waiting
- Can we help you finish?
- A friendly little reminder 🙂
- Before this price goes back up
- You’re one click from done
- Should we say goodbye? (or not)
Automate your follow-ups
Abandoned cart, win-back, welcome: these sequences run on their own with the right marketing automation tool.
10 event and launch subject lines
Webinar, product news, seasonal moment: here the subject builds anticipation and gives a reason to block a date or discover something early.
- It’s official: {new thing} is coming
- Save your spot, only a few left
- You’re invited (live, Thursday 6pm)
- Early access: open before everyone else
- Save the date 📅
- The replay is now online
- New: see what we’re building
- Just 2 days until the big day
- Your personal invitation has arrived
- See you tomorrow, we’re waiting for you
Quick quiz
Which subject line length limits the risk of truncation on mobile?
Which mistakes kill your open rate?
Even with a good angle, some habits sabotage your subject lines. The most common ones:
- All caps and machine-gun exclamation marks: “AMAZING OFFER!!!” looks like spam and trips the filters.
- Deliverability-risk words: “free”, “urgent” and “easy money” stacked together damage your sender reputation.
- Subject and content mismatch: promising one thing and delivering another inflates unsubscribes and complaints.
- A generic subject: “Our July newsletter” activates none of the six levers, nobody has a reason to open it.
- Too many emojis: past one, the effect reverses and the subject becomes unreadable in preview.
The method that works over time stays the same: write several variants, A/B test them and look at both opens and clicks. To go further, our article on email open rate details the benchmarks to aim for and the complementary levers (segmentation, send time, list cleaning).
The next step
You have your subject lines, but you still need the tool to send and test them? Check out our comparison of the best email marketing software for 2026, or explore the whole email marketing hub.
Frequently asked questions
What is the ideal length for an email subject line?
Aim for roughly 30 to 50 characters, or 6 to 9 words. On mobile, longer subjects are often truncated, so put the most important information first and let the preheader complete the promise.
Should you use emojis in email subject lines?
Yes, but sparingly. One well-chosen emoji catches the eye and humanises the subject. Past a single one, the effect reverses, the subject becomes unreadable in preview and some spam filters react. Always test a version with and a version without an emoji.
How do you know which subject line works best?
Use the A/B test built into your email platform: two subject lines go to a sample of your list, and the top performer is sent to the rest of your contacts. Look at open rate, but also click rate, which is more reliable since Apple Mail Privacy Protection.
Does adding the first name improve opens?
The first name can help, but its effect has faded because everyone uses it. The most effective personalisation relies on real behaviour: purchase history, segment, last page viewed. A subject that reflects what the person actually did grabs more attention than a plain first name.
Which words should you avoid to stay out of spam?
Avoid full caps, machine-gun exclamation marks and a pile-up of risky words like “free”, “urgent” or “easy money”. In isolation these terms are not blockers, but stacking them, combined with a poor sender reputation, degrades deliverability.