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Don’t send emails on a Monday

Author's avatar By Robert Jones 07 Mar, 2017
Essential Essential topic

Chart of the day: Analysis of email errors and subject lines suggest Monday is the worst day for email sending

In a study by Boomerang App in late 2016, Monday is found to be the day to avoid sending emails

The research found that the day with the most subject errors on average was a Monday.

Response rates also fell by 14% for emails which contained such errors and emails with errors received a 29% reply rate compared with 34% for error-free emails.

The research also went on to find that emails sent on a Monday were also the most negative.

  • Source: Boomerang 
  • Sample/ Data source: Subject lines from more than 250,000 emails were passed through an automated grammar-checking library and reported by day
  • Recommended resource: Use our Email Marketing Broadcast Checklist before you send your next email


Author's avatar

By Robert Jones

Robert Jones is a specialist in CRO, UX Research, insight and digital Marketing. He is CRO Analyst at Enjoy Digital. He has a Psychology Masters of Research, has run large digital marketing campaigns to build research panels and worked in insight roles for Vision Critical, ASDA and WhatUsersDo. He also managed all of Smart Insights member resources and published several guides including "How to conduct Persona Research" as well as contributing over 100 blog posts to the Smart Insights blog. When he isn’t working on marketing campaigns he is most likely eating authentic Italian food or planning his next short trip. You can connect with Robert on LinkedIn or follow him on Twitter.

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