From:" is technically a "personalization" just like other headers such as e.g. "To:", "Subject:", and so forth.from:/mailfrom: are technically synonyms of each other, e.g. both being the mailfrom:, as that would somehow make better sense.from:/mailfrom: in the outer area, or the from: under personalizations:, they all seem to indicate the optional friendly name: string, which the actual SMTP MAIL FROM (mailfrom:) / Envelope From / Bounce address doesn't have.name: only makes sense for the bcc:/cc:/from:/reply_to:/to: within personalizations:, if you ask me.bcc:, it depends quite much on how their system is handling the bcc: though.headers:, reply_to: and subject: both in the outer area, as well as the inner personalizations: area makes absolutely no sense either.wrangler. You can make the API calls with your HTTP-client of choice
