Why have my email open rates dropped suddenly after a redesign and what steps can I take to fix it?

Summary

A sudden drop in email open rates after a redesign can be caused by several factors. Potential issues include: problems with how the new design renders across different email clients and devices, content triggering spam filters, negative impacts on sender reputation (due to changes in content or sending patterns), poor list hygiene, irrelevant content, boring subject lines, and Google not pre-fetching images. Technical considerations involve ensuring HTTPS compliance, implementing a proper List-Unsubscribe header, monitoring and responding to feedback loops (FBLs), testing email placement (especially in Gmail), and verifying the provider's event collector is working correctly. Strategic fixes include improving list segmentation, personalizing subject lines, optimizing preview text, ensuring mobile-friendliness, conducting thorough email testing, reviewing email content for spam triggers, and allowing time for machine learning filters to adjust after fixes.

Key findings

  • Design Rendering: Inconsistent rendering across email clients and devices can deter opens.
  • Spam Filters: Redesigned emails might trigger spam filters due to new content or code.
  • Sender Reputation: Sudden changes can negatively impact sender reputation, lowering open rates.
  • List Hygiene: Poor list hygiene (inactive subscribers) and irrelevant content decrease engagement.
  • Image Pre-fetching: Google might not pre-fetch images for 'new' mail, artificially depressing open rates.
  • HTTPS Compliance: Non-HTTPS links and a non-compliant List-Unsubscribe header impact deliverability.
  • Subject Lines: Uninteresting Subject Lines have a negative effect on open rates
  • Mobile Friendliness: Designs that are not mobile friendly have a negative impact on open rates.

Key considerations

  • Test Design: Thoroughly test email design across various clients and devices.
  • Review for Spam: Carefully review the email's content and code for spam triggers.
  • Maintain List Hygiene: Implement list validation and cleaning to remove inactive subscribers.
  • Gmail Placement: Test email placement in Gmail to identify delivery problems.
  • Subject Lines: Create engaging, and interesting Subject Lines.
  • https Compliance: Ensure links are HTTPS and List-Unsubscribe header is compliant.
  • Feedback Loops: Monitor and respond to feedback loops to address complaints.
  • Google/Yahoo Compliance: Adhere to Google and Yahoo’s latest email sending requirements.
  • Monitor Sender Score: Monitor sender reputation metrics and address any issues.
  • Optimize for Mobile: Ensure the new design is mobile-friendly and accessible.

What email marketers say
10Marketer opinions

A sudden drop in email open rates after a redesign can be attributed to a variety of factors. These include issues with how the new design renders across different email clients, triggering spam filters due to changes in content or code, or negatively impacting sender reputation. List hygiene, audience interest, inconsistent sending schedules, and poor subject lines are also contributing factors. Testing the email design across various clients and devices is essential, as are measures to ensure list validation, proper unsubscribe mechanisms, and monitoring sender reputation.

Key opinions

  • Design Issues: The new design may not render correctly across all email clients and devices, deterring opens.
  • Spam Triggers: The redesigned email might contain elements that trigger spam filters, leading to lower inbox placement.
  • Sender Reputation: Changes in sending patterns or content can negatively affect sender reputation, impacting deliverability.
  • List Quality: Poor list hygiene (inactive subscribers) and irrelevant content can decrease engagement.
  • Subject Line Impact: Poorly written or irrelevant subject lines can lead to lower open rates.
  • Mobile Friendliness: If the new design is not mobile friendly, this can lead to lower open rates

Key considerations

  • Email Testing: Thoroughly test the new email design across different email clients and devices to ensure proper rendering.
  • Spam Filter Review: Review the email's content and code for potential spam triggers.
  • List Management: Implement list validation and cleaning practices to remove inactive subscribers.
  • Subject Line Optimization: Craft compelling and relevant subject lines that encourage opens; perform A/B testing.
  • Sender Reputation Monitoring: Monitor sender reputation and address any identified issues promptly.
  • A/B Testing: Experiment with different elements of the email design and content to see what works for your audience.
  • Accessibility: Ensure the design is accessible to all users, including those with disabilities.
Marketer view

Email marketer from ActiveCampaign Blog responds that a decrease in open rates after a redesign could be due to the new design being flagged as spam. Review the email's content and code for any potential triggers, and A/B test different elements to see what resonates best with your audience.

June 2021 - ActiveCampaign Blog
Marketer view

Email marketer from HubSpot Blog explains that a drop in open rates can be caused by changes in list hygiene (more inactive subscribers), shifts in audience interest, or deliverability problems. Redesigning emails might introduce code issues affecting how emails are received and displayed, potentially triggering spam filters.

October 2022 - HubSpot Blog
Marketer view

Email marketer from Email on Acid explains the importance of email testing before sending. They share that using their testing tool is an essential step to confirm your HTML emails will render correctly across a wide variety of email clients and devices.

March 2024 - Email on Acid
Marketer view

Email marketer from Sendinblue Blog shares that strategies to improve open rates include segmenting your email list, personalizing subject lines, and optimizing email preview text. If a redesign coincides with a drop, evaluate whether the new design is mobile-friendly and accessible.

October 2021 - Sendinblue Blog
Marketer view

Email marketer from ZeroBounce states that email list validation is a crucial component of email marketing. Ensuring list hygiene through validation prevents bounces and helps keep open rates up.

October 2021 - ZeroBounce
Marketer view

Email marketer from Neil Patel's Blog shares that several factors can affect open rates, including subject line relevance, sender reputation, email timing, and list quality. A sudden drop after a redesign might indicate issues with how the new design renders across different email clients or a negative impact on sender reputation due to changes in email content.

May 2022 - Neil Patel's Blog
Marketer view

Email marketer from Mailchimp Resources shares that inconsistent sending schedules, irrelevant content, and poor subject lines can negatively impact open rates. A redesigned email may inadvertently contain elements triggering spam filters, leading to lower inbox placement and fewer opens.

August 2021 - Mailchimp Resources
Marketer view

Email marketer from Marketing Discussions Forum suggests that if a redesign coincides with a sudden drop in open rates, test your email across various email clients and devices to ensure compatibility. Coding errors or broken layouts can deter recipients from opening the email.

May 2022 - Marketing Discussions Forum
Marketer view

Email marketer from Reddit states that a sudden drop often means you've triggered spam filters. Check your content against common spam triggers and ensure your IP address isn't blacklisted. Also, make sure your 'from' address isn't new or drastically changed.

October 2021 - Reddit
Marketer view

Email marketer from Optinmonster says subject lines are the first thing subscribers see, which makes it important to write compelling ones. Share that you must test different options with A/B testing and write multiple options for each email.

August 2022 - Optinmonster

What the experts say
8Expert opinions

A sudden drop in email open rates after a redesign could stem from several technical and strategic issues. Google potentially not pre-fetching images for 'new' mail, non-HTTPS links, and a non-compliant List-Unsubscribe header can negatively impact open rates. Testing email placement in Gmail (inbox, promotions, spam) using new accounts and + addressing can help diagnose deliverability. Furthermore, monitoring and responding to feedback loops (FBLs) is crucial. A boring subject line also results in no opens. It's also key to allow time for machine learning filters to adjust after technical fixes. If reporting is off, consider a problem with the provider's event collector.

Key opinions

  • Image Pre-fetching: Google might not pre-fetch images for 'new' mail, artificially depressing open rates.
  • HTTPS Compliance: Non-HTTPS links and a non-compliant List-Unsubscribe header can negatively impact deliverability.
  • Gmail Placement: Email landing in spam folder indicates delivery problems; inbox/promotions suggests image pre-fetching issues.
  • Feedback Loops: Monitoring and responding to feedback loops is essential for maintaining email deliverability.
  • Subject Line: Poor subject lines are a reason for decreased open rates.
  • Reporting Problems: Potential event collector issues.

Key considerations

  • Fix HTTPS Issues: Ensure all links are HTTPS and the List-Unsubscribe header is compliant.
  • Test Gmail Placement: Use new Gmail accounts and + addressing to test email placement.
  • Monitor Feedback Loops: Consistently monitor and respond to feedback loops.
  • Subject Line: Write compelling subject lines for your emails
  • Event Collector: Raise a ticket with your ESP if there is a reporting problem.
  • Allow Adjustment Time: Give machine learning filters a few weeks to adjust after fixing HTTPS issues.
Expert view

Expert from Email Geeks suggests that Google might not be pre-fetching images for 'new' mail (change IP, change DKIM domain, etc.), which can lower open rates temporarily while filters adjust. She also notes the links aren't https:// and recommends fixing, suggesting this could cause images not to be fetched.

December 2021 - Email Geeks
Expert view

Expert from Email Geeks advises that there's no reason to stop sending emails, recommends to fix the List-Unsubscribe header and ensure links are https://.

May 2021 - Email Geeks
Expert view

Expert from Email Geeks suggests it could be a technical issue with the provider's event collector reading redirect calls, particularly if the reporting issue is across the board, recommend raising a ticket with the provider.

July 2023 - Email Geeks
Expert view

Expert from Spamresource.com shares that consistently monitoring and responding to feedback loops (FBLs) is essential for maintaining email deliverability and open rates. FBLs provide insights into recipient complaints and spam reports, allowing senders to promptly address issues, improve email practices, and protect their sender reputation.

August 2022 - Spamresource.com
Expert view

Expert from Email Geeks recommends allowing a few weeks for everything to settle and the machine learning filters to catch up after fixing the https issues. She thinks that the lack of https:// links may have stopped pre-fetching, causing artificial depressed open rates.

February 2023 - Email Geeks
Expert view

Expert from Email Geeks recommends creating a new Google account and sending mail to it to check placement (inbox, promotions, or spam). She explains that inbox/promotions placement suggests good reputation and the issue might be image pre-fetching. She also recommends fixing the non-compliant List-Unsubscribe header, which should be https://.

July 2021 - Email Geeks
Expert view

Expert from Word to the Wise responds the subject line is your email's trailer. Is it exciting, intriguing, benefit-driven? A boring subject line equals zero opens. Also, avoid sounding generic. Use specific numbers, stats, or details. The more targeted you are, the better.

November 2022 - Word to the Wise
Expert view

Expert from Email Geeks suggests sending two new emails to a Gmail account with + addressing (+noopen and +browser). The +noopen is a negative control and the +browser tag is for checking if mail opens are showing outside of Google by copying the open tracking link to the browser to test.

November 2023 - Email Geeks

What the documentation says
4Technical articles

Email design should prioritize consistent rendering across clients and devices; broken elements deter opens. Sender reputation is crucial; changes in sending patterns or content can negatively affect it. Google Postmaster Tools can monitor reputation, spam rates, and feedback. A proper List-Unsubscribe header is also essential, as well as adherence to the latest requirements from Google and Yahoo, for avoiding spam filters.

Key findings

  • Rendering Issues: Inconsistent rendering across email clients and devices can deter opens.
  • Sender Reputation: Sudden changes in sending behavior can negatively affect sender reputation and open rates.
  • Monitoring Tools: Google Postmaster Tools provides insights into sender reputation, spam rates, and feedback loop complaints.
  • List-Unsubscribe Header: A properly implemented List-Unsubscribe header is essential for compliance and avoiding spam filters, especially due to new requirements from Google and Yahoo.

Key considerations

  • Design Testing: Thoroughly test email designs across various clients and devices.
  • Monitor Sender Score: Consistently monitor sender reputation metrics and address any issues.
  • Use Postmaster Tools: Utilize Google Postmaster Tools to track key deliverability metrics.
  • Implement List-Unsubscribe: Ensure the List-Unsubscribe header is properly implemented and compliant with current standards.
  • Compliance: Adhere to Google and Yahoo’s latest email sending requirements.
Technical article

Documentation from Google Postmaster Tools shares that using Google Postmaster Tools to monitor sender reputation, spam rates, and feedback loop complaints is key to troubleshooting deliverability issues. Significant changes in these metrics after a redesign can point to specific problems.

April 2023 - Google
Technical article

Documentation from Validity (formerly Return Path) explains that sender reputation is crucial for email deliverability. Sudden changes in sending patterns or content can negatively affect reputation, leading to lower open rates. Monitor sender score and address any identified issues.

November 2021 - Validity
Technical article

Documentation from RFC shares the importance of implementing a proper List-Unsubscribe header, to ensure compliance with email standards and to avoid spam filters. This is especailly important since Google and Yahoo have announced new requirements around spam thresholds and easy unsubscribe mechanisms.

September 2024 - RFC
Technical article

Documentation from Litmus explains that email design should prioritize rendering consistency across various email clients and devices. Issues like broken images, incorrect formatting, and unresponsive layouts can deter recipients from opening and engaging with emails. A new design must be thoroughly tested.

January 2024 - Litmus