What is one element that Marketo does NOT allow for A/B testing?

In Marketo, A/B testing is a valuable feature that includes various elements to help optimize campaigns by comparing two variants. However, one element that is not available for A/B testing is the date or time of sending an email.

When executing an A/B test in Marketo, marketers can test different subject lines and email layouts, allowing them to see which variations perform better based on open rates or engagement metrics. Additionally, images can also be included in these tests, as they can significantly influence recipients' responses and overall campaign performance.

On the other hand, the date or time when an email is sent does not lend itself to a straightforward A/B testing scenario within the platform, as this variable affects the entire sending strategy rather than being isolated to specific content types. Testing different sends at different times would typically require separate campaigns rather than a true A/B test setup, making it an untestable parameter alongside the chosen content variations.