Abandoned cart email subject lines
51 lines, organised by where they sit in the sequence rather than by mood, because the third email cannot open the way the first one did. Plus the length limits that actually apply, and the point at which the subject line stops being your problem.
Four rules worth more than any list
Write for 40 characters, not 60
Most ecommerce email is opened on a phone, and most phone mail apps cut the subject line somewhere in the thirties. Whatever your line means, it has to mean it early. Test yours by covering everything after the fortieth character and reading what is left.
Say what happened, not how you feel about it
"You left something behind" works because it describes a fact the reader recognises. "We miss you already!" describes the sender. The first reads as a service, the second as marketing, and one of those gets opened.
Do not lead with a discount
It is the most expensive way to recover a cart and it has a second cost that arrives later. Shoppers who learn that abandoning produces a coupon will abandon on purpose, and you end up discounting orders that would have completed anyway.
Only claim urgency that is real
If the cart does not expire, do not say it expires. Beyond the honesty problem, shoppers check. A line that promises the basket disappears tonight, followed by the same basket sitting there next week, teaches them that nothing you send is true.
Subject lines by position in the sequence
Most lists sort by tone, which is why so many sequences send three versions of the same reminder. Sort by position instead. Each email has a different job because the reader has already ignored the one before it.
First email, sent within the hour
They left minutes ago and still remember the basket. The job is a reminder, not persuasion. Say what happened and nothing else.
- •You left something behind
- •Your cart is saved
- •Still thinking it over?
- •Did your checkout not go through?
- •We saved your basket
- •Your items are waiting
- •Forgot something?
- •Want to finish where you left off?
- •Your cart, one tap away
- •Picking up where you stopped
Second email, next day
The reminder did not work, so repeating it will not either. Give them a reason: answer the objection they probably had.
- •Questions about your order?
- •Free returns, in case you were unsure
- •Still available in your size
- •Here is what other people asked before buying
- •Not sure it is right for you?
- •A quick note about shipping
- •Anything we can help with?
- •The part people usually want to know first
- •We ship in 48 hours, if that was the worry
- •Two things worth knowing before you decide
Third email, day three or four
The last one. Either something changes, or you stop. Scarcity here has to be true, and a discount here trains people to abandon.
- •Last chance on your saved cart
- •We are releasing your items soon
- •Your cart expires tonight
- •Closing this off
- •Final reminder about your basket
- •Should we let these go?
- •One last look
- •We will stop emailing after this
- •Your size is nearly gone
- •Closing your cart tomorrow
Subject lines by situation
The same sequence should not go to a first-time shopper who hesitated and a returning customer whose card was declined. These are the four cases worth separating.
High value carts
The hesitation is rarely price. It is trust, delivery, or returns. Address the risk, not the cost.
- •Your order, fully insured
- •Free returns on everything in your cart
- •Speak to someone before you buy
- •Delivery in two days, tracked
- •A note on our returns policy
- •We are here if you have questions
Repeat customers
They have bought before, so the reminder can be warmer and shorter. Use what you know.
- •Back for more?
- •Same as last time, waiting for you
- •Your usual is in your cart
- •Welcome back, your basket is saved
- •Ready when you are
When the payment failed
Different problem entirely. They tried to pay and were refused, so a cart reminder reads as tone deaf.
- •Your payment did not go through
- •Your card was declined, nothing was charged
- •Finish your order securely
- •A problem with your payment
- •Your order is on hold
With an incentive, if you must
Only after the first two emails, and only when margin allows. An early discount teaches people to abandon and wait.
- •10% off the cart you left
- •Free shipping on your saved items
- •A small thank you for coming back
- •Your discount expires tonight
- •We knocked something off
Lines that never reach the inbox
A subject line can be judged before a human sees it. No single word sends you to spam on its own, but stacking these with heavy punctuation and capitals is the pattern filters are built to catch, and a cart reminder is exactly the kind of message that gets caught.
- Avoid writing whole words in capitals. One word for emphasis is survivable; a line in capitals is not.
- One exclamation mark at most, and ideally none. Three is a signal, and not the one you want.
- Do not put a currency amount in the subject line of a first reminder. It reads as an advert rather than a service message.
- Authenticate your sending domain. Deliverability is decided far more by SPF, DKIM and DMARC than by word choice, and no subject line survives a domain that fails them.
When the subject line is not the problem
Everything above assumes email is the right way to reach this person. Often it is not, and no amount of rewriting fixes that.
A cart recovery email lands in an inbox alongside everything else that arrived that morning, and it has to win attention before it can say anything. That is the entire reason the subject line matters so much. It is a door charge.
A message on WhatsApp or SMS has no subject line, because it does not need one. It appears on the lock screen with the first words of the message already visible. There is nothing to optimise, no inbox to compete in, and no spam folder to escape. The trade is that these channels are more intrusive and more expensive per send, so they earn their place on carts worth recovering rather than on all of them.
The practical read: keep email for volume and use it well, and put the messaging channels on the carts where the value justifies a more direct approach. If you are rewriting subject lines for the fourth time and recovery has not moved, the channel is the thing to change, not the words.
Cheap, high volume, competes with everything else in the inbox. The subject line decides whether it exists.
Read within minutes, no subject line, replies are conversational. Costs more per send.
SMS
Almost always read, very short, no room for persuasion. Best for one clear link.
Frequently asked questions
How long should an abandoned cart subject line be?
Aim for roughly 30 to 50 characters. Most mobile mail apps show somewhere between 30 and 40 characters before truncating, and the majority of ecommerce email is opened on a phone. If the meaning of your line only arrives at character 60, most people never see it. Front-load the words that carry the message.
Should I use the customer name in the subject line?
Sometimes. A first name works when the rest of the line is plain, and reads as automated when the line is already trying hard. It also fails badly when your data is messy, and a subject line addressed to "there" or "null" costs you more than personalisation gains.
Should I put a discount in the subject line?
Not in the first email. Shoppers learn quickly, and a store that always sends a discount after abandonment teaches people to abandon on purpose. Keep the incentive for the third email, if at all, and only where the margin survives it.
How many abandoned cart emails should I send?
Three is the common pattern: a reminder within the hour, an objection-handling email the next day, and a final one a few days later. Beyond three, replies drop and unsubscribes climb, so you are spending list health to chase a shopper who has decided.
Do emojis help in abandoned cart subject lines?
They help a line stand out in a crowded inbox and they hurt if they replace meaning. One at the start or end is fine. A line built out of emojis reads as promotional, and some corporate mail clients render them as boxes, which looks broken.
What if my open rates are fine but nobody buys?
Then the subject line is doing its job and the problem is further down. Check that the link returns them to a working cart rather than an empty one, that the price they see matches what they left, and that the page loads quickly on a phone. A great subject line in front of a broken checkout just gets you a better view of the same loss.
Or skip the inbox entirely
Cartio reaches the shopper on WhatsApp, SMS or an AI voice call instead, answers whatever stopped them, and sends a link straight back to their cart. No subject line to write.
Launch is $0 a month and 12% of what Cartio recovers.