Test Your Marketer’s Gut: Email frequency contest


Sending more than 1.2 billion emails per year is a significant marketing investment. And for one of our Research Partners, this effort raised several questions:

  • When will their list get irritated?
  • How many emails should be sent on a regular basis?
  • At what point do emails start hurting sales?

To ensure they were getting the most value from their marketing spend, our Research Partner wanted definitive, data-driven answers. So we tested for the optimal frequency that will maximize total revenue. While our scientists now have the benefit of reams of information and know the answer to these questions, we thought it would be a fun challenge to your “marketer’s gut” to test your acumen and see if you could spot a winner based on sheer intuition (and yes, there is a prize).

Background: The Research Partner is a large ecommerce company that sells well-known, inexpensive, perishable products online (if we told you any more we’d have to kill you). They had a massive, yet varying email send rate and was emailing the house list anywhere from once a week to four times a week. Most of the Research Partner’s strategy was based on the offers available at the time. With such variance in frequency, we wondered if sending more email messages would have overly negative effects on unsubscribe rates. And likewise, we wondered how much impact sending fewer emails would have on revenue. Ultimately, we were looking for that optimal email-sending sweet spot.

Test Design: We took a small, highly-motivated segment of the Research Partner’s house list and used it as our testing sample. We then split that list into seven segments that would receive different send frequencies as represented below:

    Segment 1: 1X PER MONTH
    Segment 2: 2X PER MONTH
    Segment 3: 3X PER MONTH
    Segment 4: 4X PER MONTH
    Segment 5: 6X PER MONTH
    Segment 6: 10X PER MONTH
    Segment 7: 15X PER MONTH

We monitored the effect of the send frequencies for 60 days. We tracked delivery, open rates, click-through, conversion, revenue, spam complaints, and unsubscribe rates throughout the duration test.

Email Sends GraphResults: Testing for optimal frequency assumes that revenue and unsubscribes will increase at a steady rate until the list gets irritated. At that point, revenue will experience diminishing returns and even decrease. Likewise, unsubscribe rates will increase at that point of irritation.

We wanted to test the validity of this assumption, as well as discover the optimal email frequency for this company’s email list that increased both total revenue and lifetime value of the customer.

But before we reveal the results from our scientists’ brains, we want to test your “marketing gut” with the following question (Oh, and just to spice things up a little, one person’s intuition will get them a free seat in one of our online certification courses – normally $595.):

  1. What is the optimal monthly send frequency for this company?
    1. 1-2 per month
    2. 3-5 per month
    3. 6-9 per month
    4. 10-15 per month

Congratulations to Sharon Mostyn, winner of the Email Frequency Contest, and one of only a handful of correct responses. Sharon chose the Landing Page Optimization Course as her prize. Subscribe to the MarketingExperiments Journal to be notified when the web clinic replay and research brief are available so you can see the correct answer along with a full analysis of how this discovery can help you shape your email campaigns.

To enter the contest, leave your choice as a comment to this blog post along with your email address or Twitter handle (make sure you’re following @MktgExperiments so we can reach you). We will select a winner randomly from the correct responses (and yes there is a correct answer). The winner and results for this test will be announced live on Wednesday afternoon at 4 p.m. EST during our free web clinic – Optimize your Email in Three Steps: How one marketer tripled revenue from their house list.

You might also like
  1. Online Marketing Mentor says

    c. 6-9 per month

  2. Predrag says

    c. 6-9 per month


  3. Deborah says

    My choice is b. 3-5 times per month.

  4. Damian Pang says

    6-9 per month

  5. Cate says

    b. 3-5 per month


  6. Shanna Korby says

    c: 6-9 per month

  7. Shanna Korby says

    @Shanna Korby
    and my twitter is @korbyimagery

  8. Jonathan Morgan says

    b: 3-5 per month – When I think perishable, I think flowers, produce or candy. Any more than 3-5 of those a month and I would unsubscribe.


  9. Susan Paskowitz says

    b:3-5 per month

  10. @virginhill says

    I’m for 6-9 as well.

  11. Jay Gohil says

    c: 6-9 per month

  12. Drew MacD says

    My gut says 3-5. Looking forward to getting the goods on the web clinic!

  13. Tom Carswell says

    My choice is 3-5 per month.

  14. Paul P says

    I’m sticking with 6-9months.

  15. Cristian Ionica says

    I think the correct answer is 3-5 per month.

  16. Sharon M says

    I’m going to go out on a limb with d. 10-15/month.

  17. Sue Thompson says

    b. 3-5 (one per week).

  18. Mieszko - GoalGorilla says

    Guesstimate 3-5 per month.


  19. Rick Coltman says

    6-9 per month

  20. Justin Premick says

    Sure, I’ll bite.

    Put me down for c. 6-9 per month


  21. Jeff Ogden says

    I picked b. 3-5.

  22. Rohan Kumar says

    D. 10-15x per month

  23. Hair Foils says

    Sure, I’m in as well.

    Put me down for a. 1-2 per month

  24. Darko says

    a. 1-2 per month

  25. Didi Lomont says

    I’m guessing 3-5 per month.

  26. Richard Osborne says

    c. 6-9 per month

  27. Jason Markantes says

    6-9 per month. Which seems like a lot to me, but that’s why I test- instincts can be misleading. 🙂

  28. Wade Lagrone says


  29. Ben D says

    I have to go with c. 6-9 since were dealing with perishables, which tells me the repeat purchase my come more quickly from a coupon motivated buyer.

  30. Jon Standring says

    I presume 6-9 a month but I want it to be less…

  31. Cathy McKillip says

    6-9 per month.

  32. Sandi Abbott says

    I’v found weekly to be ideal, especially for online sales. So I’ll go with 3 – 5 a month.

  33. massimo says

    b. 3-5 times per month.

  34. Richard Hayes says

    It would useful to know what the ‘perishable products’ are.

  35. Jayanthi says

    b. 3-5 per month

  36. Chris says

    I’m going with 3 – 5/month.

  37. Casey says

    D. 10-15

    I’m guessing chocolate, folks.

  38. Jesse says

    b. 3-5 times per month. My gut tells me that more than once a week hearing from a marketer is going to kill sales.

  39. Kristi Daniels says

    15 per month

  40. Adam says

    c: 6-9 month

    I am very curious to see the results.

  41. Jim Stafford says

    Once you identify the right number of contacts per segment per month (or other period like week) you need a mechanism to help enforce those rule. I recen;y wrote a blog that addresses how to enforce communication strategies. Please find it here. I’d love to get your thoughts. http://blogs.marketingstudio.aprimo.com/blog/marketing-automation-corner/0/0/email-marketing-when-less-is-more

Leave A Reply

Your email address will not be published.