The answer is: sometimes, but usually no. To be transparent: A/B testing shows that interactive emails can see a 5-7% decrease in open rates compared to static emails, though this applies to some customers rather than most.

If the difference in open rates is greater than 5-7%, it is likely caused by a Klaviyo tracking problem rather than caused by a true open rate difference. There is a quick fix for this (skip below to How to solve for known tracking problems).

There are actions you can take to mitigate this impact. However, at the end of the day, Zaymo customers see significantly higher engagement rates & conversion rates with the interactive email--even when open rates are a bit lower. If you prefer open rates over conversion rates, Zaymo may not be a good fit.

How to solve for known tracking problems

Many customers have learned that the open rates were truly the same but found a default Klaviyo setting that messed with the reporting. Check the Email tracker position in Klaviyo to make sure the setting is Top of email content.

• Access this setting at: https://www.klaviyo.com/settings/email/attribution

• Set your tracking pixel position to "Top of Email"

• Click Save

How to mitigate Zaymo's impact to open rates

Lower email size

One of the biggest levers you can pull is lowering the email size. Deliverability experts say it is best to keep email size under 100KB. We notice that open rate discrepancies are less common in emails below this threshold.

Try not to overload your email with several Zaymo blocks as each block can add significant size.

Zaymo's builder won't allow you to export an email that has more than 200KB in the AMP version of the email.

Do campaigns affect open rates more than flows do?

Some customers have reported greater open rate discrepancies in campaigns when compared to flows. While uncommon, there is enough data to point to a pattern.

Oftentimes, the engagement rates are similar, and Zaymo is unsure whether Klaviyo's campaign settings make the reporting unclear or the open rate truly is much lower.

Zaymo is actively investigating this pattern.

Additional resources

Klaviyo's deliverability center

Litmus's 2025 deliverability guide