15 email subject lines to stand out in a crowded inbox

Leverage the power of a well-crafted subject line!

In the fast-paced world of digital communication, a compelling subject line can make the difference between your email being opened… or ignored. In this article, we take a look at how to make your emails stand out in a crowded inbox and offer some tips for crafting great subject lines with the Email for Trello Power-Up. Let’s dive in.


How to write a stand-out subject line

Writing a compelling email subject line is about understanding what appeals to your audience, and how to use that to leave the right first impression. There’s no one-size fits all solution, but here are a couple of useful pointers to keep in mind.

  • Be specific. Clickbait is the new normal, so it’s refreshing when an email does exactly what it says on the tin. A little bit of mystery is okay, but try to be specific and upfront about the content of your email so that people know what to expect.

  • Include an emoji. If it’s appropriate for your brand tone of voice, using an emoji in your subject line can add a fun pop of color to an otherwise boring inbox – and help prompt better open rates.

  • Drive action. A sense of urgency makes it more likely that your customer will take action on your email, but be careful to remain genuine or you risk sounding spammy.

  • Get personal. Connect with your customers by addressing them by name, or tailoring the subject line to their interests or previous interactions with you.

  • Time it right. It’s not always what you say, it’s when you say it! Although it seems obvious, try to get people at a time when they’re primed for your message. This could be time of day, season of the year, or based on when someone last purchased from you.

15 email subject line ideas to set you apart

Sales subject lines

  • Take $50 off an annual subscription

  • Oh no, your subscription is expiring ⌛

  • What did you think? Write a review.

Find out more about managing your sales pipeline in Trello.

Recruitment subject lines

  • Join our team: We’re looking for a sales manager

  • 5 steps to accelerate career growth 📈

  • Résumé tips webinar Tuesday @12pm

Find out more about using Trello for recruitment and HR.



Event subject lines

  • 📆 Mark your calendar for these key dates!

  • [Your event]: What you need to know

  • [Customer name], it’s that time again! Annual [event name]

Find out more about project management in Trello.

eCommerce newsletter subject lines

  • Enjoy 20% off + Free shipping!

  • Your order has shipped. Here’s your tracking number 📦

  • Get ready for Christmas with [your company]

Find out more about running your eCommerce business in Trello.

Bookings and reservations subject lines

  • [Action required] Verify your email address

  • 🏖️ Your pre-vacation checklist

  • Limited availability in June: Book a table now

Find out more about managing bookings and reservations in Trello

Subject line tips with Email for Trello

The Email for Trello Power-Up is a great way to send and receive email – right from Trello! You can also combine it with Trello automation to send emails automatically, based on card move, time elapsed, and more.

There are also two ways to control the subject line with Email for Trello:

  1. You can set the subject line of your email when you send a new email using automation.

  2. You can also include variables and Custom Fields in your subject line to further personalize your email.


Master the art of a great email subject line

In today’s digital landscape, a well-crafted subject line is essential to engaging your audience and driving action. Experiment with these suggestions and tailor them to your audience to stand out in your customer’s inbox – happy emailing!

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