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Email Testing Guide: What to Look for Before You Hit Send

Updated: Apr 24

Before you hit send on any email campaign, you should engage in a thorough email testing process. From the sender information to the subject line, every element plays a crucial role in engaging your audience and driving action. In this guide, we'll explore the key aspects of email testing and provide a comprehensive checklist to help you optimize your email campaigns.

Sender Information

  • Check the Sender Information: Verify the sender's name, organization, and reply-to address for accuracy.

  • Domain Verification: Ensure your domain is verified with DKIM, SPF, and DMARC settings to enhance email deliverability.

New Email Deliverability Requirements

  • SPF, DKIM, DMARC: Familiarize yourself with these protocols to authenticate and secure your emails.

  • Honor Unsubscribe Requests: Adhere to unsubscribe requests promptly and include a visible unsubscribe link in your emails.

  • Maintain Low Spam Complaint Rate: Avoid a spam complaint rate above 0.30% by monitoring your email deliverability status.

Subject Line

  • Check for Errors: Ensure your subject line is free of spelling and grammar mistakes.

  • Prioritize Information: Place the most important information at the beginning of your subject line.

  • Subject Line Preheader Consistency: Ensure coherence between your subject line and preheader text.

  • A/B Testing: Consider running A/B tests to optimize subject line performance and use tools like subjectline.com for evaluation.


  • Verify Link Accuracy: Confirm all links direct to the correct pages.

  • UTM Tracking: Include UTM parameters for tracking and use tools like Google's Campaign URL Builder.

  • Descriptive Link Text: Ensure link text is descriptive and relevant to the destination.

Template Accuracy

  • Header Image: Ensure the header image links to your website homepage.

  • Unsubscribe Link: Include a visible unsubscribe link in compliance with regulations.

  • Copyright Year: Update the copyright year to the current year in the footer.

  • Social Media Icons: Verify that social media icons link to the correct profiles.

  • Error Check: Scan for broken links or spelling errors throughout the email template.

Graphics and Images

  • Alt-Text: Provide descriptive alt-text for all images.

  • Graphic Relevance: Ensure graphics align with the content of the email.

  • Spelling Check: Double-check for any spelling errors within graphics containing text.

Personalization and Merge Tags

  • Personalization: Ensure personalization features like recipient names are accurately implemented.

  • Merge Tags: Verify the accuracy of all merge tags used in the email content.

Mobile Layout

  • Mobile Compatibility: Test the email on various mobile devices like a cell phone or tablet to ensure compatibility.

  • Layout Consistency: Ensure images and text display correctly on mobile devices.

  • Mobile Link Functionality: Confirm all links function correctly on mobile platforms.

By diligently testing your emails across these crucial areas, you can ensure that your messages are optimized for maximum impact and engagement. Remember, thorough testing is the key to delivering successful email campaigns that resonate with your audience and drive desired outcomes.


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Use the email testing checklist to ensure effective email communications today.

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