How to use inbox testing
This feature is only available for paid accounts. If you currently use a free Klaviyo account, upgrade your plan to access inbox testing.
Learn how to use inbox testing directly in Klaviyo. Access Mailgun email testing without leaving your Klaviyo account or managing a separate subscription.
Inbox testing limits
Paid Klaviyo accounts include 100 inbox tests per user per calendar month. A test is counted each time an inbox preview is generated. If you select 5 inboxes to test, this counts as 5 tests. You can see your remaining tests in the inbox testing sidebar.
For this reason, it’s best to use discretion when choosing which inboxes to test: choose a small handful of inboxes based on your subscriber base. Learn how to see a breakdown of your subscribers’ inboxes.
Run an inbox test
- Open an email in the drag-and-drop editor, then click Preview.
- Select Inbox testing.
- Choose the profile or event data to use in your preview:
- For a campaign, use Search profiles to find and select a profile.
- For a reusable template, use Search profiles, or select Event and choose a metric from the dropdown. Use the arrows to choose a recent event.
- For a flow, Klaviyo shows profile or event data based on its trigger. Use Search profiles when profile data is shown, or use the arrows to choose a recent event when event data is shown.
- Under Select inbox tests, choose 1 or more inboxes to preview. We recommend choosing a small sample based on the most popular inboxes from your own subscriber base, as there is a limit on the number of previews you can generate each month. Options are grouped within the following expandable menus:
- Popular inbox tests
- Dark mode
- Mobile
- Desktop
- Web
- Optional: To save these selections for your next inbox test, select Save selections as default inbox tests.
- Review your choices. Running a new test disables your existing preview link for this email. Click Run test, then Continue if prompted.
- Wait a few minutes while your previews generate. You can navigate away from the page and return to it, but don’t make any edits to your template while the previews generate, or your previews won’t match the updated version of the template.
- Once your previews are ready, click a tile to view it in more detail.
- Use the arrows to navigate between your previews, or click Back to gallery to return to the gallery view.
- Click Done when you’re finished previewing.
How to share an email preview link
This feature is only available for paid Klaviyo accounts. Anyone with the link can view the read-only previews without signing in to Klaviyo. Check the personalized content in your previews before sharing.
- Open the email in the drag-and-drop editor.
- Click Preview.
- Select Inbox testing.
- Run an inbox test if results for the current version of the email aren’t already shown. If you closed the preview, reopen Preview > Inbox testing.
- Once the inbox test is complete, turn on sharing in the Share preview link card.
- Click the copy icon to copy the share URL to your clipboard.
- Share this link with anyone you’d like to review the email.
The sharing link is valid for up to 7 days after you create it. Check the expiration shown above the URL. The link stops working immediately if you turn off sharing or run a new test for the same email. After running a new test, turn on sharing again and copy the new link. Previewers will be able to see all the versions of the message you selected when you ran the inbox test.
Troubleshooting inbox discrepancies
Every inbox interprets HTML a little differently, which can lead to discrepancies in how emails appear. For example, when a recipient has dark mode enabled on their device, the inbox provider may adjust or invert the email’s colors to adhere to a darker color scheme. Learn how to design your emails to accommodate dark mode subscribers.
Additionally, certain inboxes offer limited support for various HTML elements. Outlook generally has the most limited support, which may impact how your email appears. Fortunately, Outlook generally represents only a small fraction of email recipients. Learn more about emails and Outlook or HTML and CSS support across inboxes.
Additional resources
- How to create, edit, delete, and manage templates
Learn how to create, edit, delete, and manage your email templates in the Email Templates tab.
- Understanding mobile email optimization
Learn about the default mobile optimization settings Klaviyo offers for emails, as well as tools for customizing how your message appears across devices. You can also choose to disable all mobile optimizations by navigating to the Styles tab of your email template.
- Understanding the deliverability tab in campaigns and flows
Learn about the deliverability tab in Klaviyo, that provides an overview of key deliverability performance metrics for your campaigns and flow emails. This can help you easily identify low-performing email domains and countries, so you can take action to protect your deliverability.