Is there a way to automatically populate the email field using Klaviyo?

Hi @OliBolly Thanks for stopping by the community! You should be able to pass the information in through hidden fields similar to this setup here so long as you use merge fields in Klaviyo. Would that work for you? 

Thanks @Liz - I was hoping that I could merge in email address into a non-hidden email field. But I’ve tested that and it doesn’t look like it works.

Not sure that it would work with Klaviyo even if it was possible though, because it looks like Klaviyo appends data to all of their outbound links, so it messes up the syntax.