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by thexa4 1039 days ago
You can add another format to the multipart/alternative container. Just like html emails often have a text fallback. It requires picking a Content-Type name (application/vnd.<your_name>.something) but then you can attach any additional metadata you want: https://kevinjmcmahon.net/articles/html-and-plain-text-multi...

The hard bit is getting email clients to use your information.