Is there an easy way to have content blocks switch out for mobile vs desktop email viewing? We would like to have one call-to-action if someone is looking at the email on their phone vs. on desktop.
I saw a demo of this, using standard Salesforce config at a Lightning Roadmap edition of the London Salesforce Developer meetup. This was back in April/May (2018) and was safe-harbour then, but not sure if/when it will actually drop. The talk was videoed and can be seen here.
Without this you could potentially use the useragent for this, or maybe even css media queries.