Most Effective Email Subject Line

As a general rule, shorter subject lines improve open rates.

  • In fact, 47% of email recipients decide whether or not to open an email based on subject line alone.
  • And with 67% of email opens taking place on mobile.
  • 69% of email recipients will mark an email as spam based on the subject line alone.
  • 85% of respondents prefer an all-lowercase subject line to one in all caps

The right phrasing can make your recipients feel special — and the effect can be magical.

Most emails never get opened.

According to, average open rates are pretty bleak:

  • 22.26% for the media & publishing industry
  • 18.31% for the marketing and advertising realm
  • And a sad 16.83% for eCommerce companies

Most Common & Effective Holiday Email Subject Line

  • Free
  • New
  • Off
  • Sale
  • Now
  • Holiday
  • Day
  • More
  • Up to
  • Gift
  • Shipping
  • Only
  • Chirstmas
  • Last
  • Get
  • Today
  • Black Friday
  • Win — Win a Trip to LA
  • Special
  • Shop — Shop at our Exclusive Online Store!

Some of the Commonest Subject Lines

  • “It’s FREE. All the tiny houses on our site and more.”
  • “Complimentary Online CME Courses”
  • “Social Media Stats You Need to Know for 2018”
  • “Get Optimizely Certified & Advance Your Career”
  • “[Ebook] Why You’re Crazy to Spend on SEM But Not A/B Testing”
  • “For our beloved customers only”
  • “An exclusive offer for you”
  • “My gift to you”
  • “You’re invited!”
  • “Private invite”
  • “Land wander-ful low fares now!”

Offer based Subject Lines

  • Enjoy this Special Offer at Our New Location
  • 25-40% off – Email-Only Offer – Today Only
  • You’re Invited! New Product Launch Party at [Your company]
  • Ends Today! 20% Off Friends & Family
  • Top 10 under $10
  • Yours in 2 days (free shipping!) + 40% off
  • Free product with purchase of [product name]
  • [New Product] has arrived. Order now before we run out.
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Creative Subject Lines

  • 10 Gift Ideas for your little ones
  • Take your pick: Our 9 Favorite [your product]
  • It’s okay, you can wait till the last minute.
  • Bring this email to our store and win!
  • New Feature: Reviews by You!
  • Sometimes all you need is a little vase lift

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