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I did not know this existed so I looked it up! Here are some docs about it: https://developers.google.com/gmail/markup/reference/one-click-action https://develo

• cyberferret 10y ago
  That's them. I had a look at these when it first was 'released' by Google, but back then it was more of an 'opt in' system I believe, with Google having to approve senders who were going to embed these schemas into their emails. Have to revisit this now to see if they have relaxed the requirements a little. It will be good if these became a normal extension to all emails and other clients such as Outlook, Yahoo Mail etc. all pick it up as a standard.