Seeking to set the “Reply-to email address” above via the api. Appears it would be set via the endpoint:
https://a.klaviyo.com/api/campaign-messages/{id}/
Per below documentation (snippet of relevant object included), there is no key/value available to do so:
https://developers.klaviyo.com/en/reference/update_campaign_message
Best answer by Brian Turcotte
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