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Testing Your Campaigns

Before sending any campaign to your subscribers, thorough testing is essential. This guide covers all aspects of campaign testing to ensure your emails look great and perform well.

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Why Testing Matters

An untested email can damage your brand reputation, hurt deliverability, and waste your marketing efforts. Always test before sending!
Common issues caught during testing:
  • Broken links or images
  • Formatting problems on certain devices
  • Personalization tag errors
  • Typos and grammar mistakes
  • Spam filter triggers

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Types of Testing

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1. Send Test Emails

1

Access Test Function

In the campaign editor, click Preview & Test or Send Test
2

Enter Recipients

Add email addresses for testing (yourself, team members)
3

Send and Review

Open the test email on different devices and email clients
Create a testing group with emails from different providers (Gmail, Outlook, Yahoo, Apple Mail) to check rendering across platforms.

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2. Visual Preview

Check how your email appears:

Desktop Preview

View full-width layout as it appears on computers

Mobile Preview

Check responsive design on smartphone screens

Dark Mode

Verify readability in dark mode email clients

Plain Text

Review the plain text version of your email
Ensure all links work correctly:

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4. Personalization Testing

If using merge tags:
Verify:
  • Tags render correctly with sample data
  • Fallback values work when data is missing
  • Dynamic content shows correct variants

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5. Spam Score Check

Run spam tests to ensure deliverability:
  • Excessive capitalization (FREE! BUY NOW!)
  • Too many exclamation points!!!
  • Spam words: “winner”, “free money”, “act now”
  • Poor text-to-image ratio
  • No unsubscribe link
  • Misleading subject lines
  • Use authenticated sending domain (SPF, DKIM)
  • Maintain clean subscriber lists
  • Include plain text version
  • Balance images with text content
  • Avoid URL shorteners
  • Include physical mailing address

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Testing Checklist

Use this checklist before every campaign:
Subject line is compelling and under 50 characters
Preview text provides additional context
Sender name and email are correct
All links are working and tracked
Images display correctly
Personalization tags render properly
Mobile view looks good
Unsubscribe link is present and functional
No spelling or grammar errors
CTA buttons are prominent and clickable
Spam score is acceptable

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A/B Testing

Beyond basic testing, use A/B tests to optimize performance:
Learn more about setting up A/B tests in our Campaign Types guide.

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Next Steps

Create Campaign

Start building your tested campaign

Scheduling

Schedule your campaign for optimal delivery