They do support Microdata as an alternative: https://developers.google.com/gmail/markup/reference/formats/microdata https://developers.google.com/gmail/markup/r

They do support Microdata as an alternative: https://developers.google.com/gmail/markup/reference/formats/microdata https://developers.google.com/gmail/markup/reference/formats... That allows markup for the regular html part of the mail to double as structured data for automation. I can't really decide what I prefer – this allows deduplication but gets complicated when the presentation doesn't follow the exact structure of the object you want to describe.