How to create a button in the body of the email so that it appears in the incoming list?

here is an example of how Google sends emails)
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June 8th 19 at 16:45
1 answer
June 8th 19 at 16:47
Just now just read about the data markup of letters in Yandex.

UPD. Here at Google have the same guide
now start reading) - henri.Huel commented on June 8th 19 at 16:50
Even if you add the right data markup, reply, offer, etc. - it does not mean that the button will be displayed. That still need to be steep (thousands of emails daily) and reliable (so that no user is never sent your letter in spam) - Jerad_Padbe commented on June 8th 19 at 16:53
the guide I read - like everything is clear, but in practice copied the code from the guide in post 1-in-1 link eventually appeared(( - henri.Huel commented on June 8th 19 at 16:56
about "cool" - it is very sad sounds( - henri.Huel commented on June 8th 19 at 16:59
I think it says. - Kayli commented on June 8th 19 at 17:02

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