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It just uses open source markup from https://schema.org/ https://schema.org/, so there is no reason that other email clients couldn't implement it as well.
by byoung2 3y ago
It just uses open source markup from https://schema.org/ https://schema.org/, so there is no reason that other email clients couldn't implement it as well.
- michaelmior 3y agoI'd really like to see Fastmail or Proton Mail implement this, but I think the majority of their customers would probably prefer they didn't.