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How to Image Swap Dynamic Content on Apple Mail

Months ago, I was picking Jay Oram’s brain about using CSS to swap out email images post-send when a light bulb went off. If we can swap out images post-send using an external CSS file… what’s to stop us from swapping out CSS post-send? 

The answer is nothing. Well, as long as you have a way to redirect a URL. Which, with Litmus Personalize, we do! By using any of the dynamic features in Litmus Personalize to point to a different URL, we’re able to host different CSS files and point to them based on time of day (like we did with our Litmus Live daily agenda emails).

Or if you want to swap out an image at a set time, you can use the countdown timer feature in Litmus Personalize. We'll be sending an email in the not-too-distant future using this feature—keep an eye on your inbox for this one!

I’m not saying that MPP isn’t great for privacy, but sometimes fun experiences end up getting sacrificed. So now we have a nice little work around to help keep experiences fun.