To send a post by email, theDocumentation Index
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newsletter query parameter must be passed when publishing or scheduling the post, containing the newsletter’s slug.
Optionally, a filter can be provided to send the email to a subset of members subscribed to the newsletter by passing the email_segment query parameter containing a valid NQL filter for members. Commonly used values are status:free (all free members), status:-free (all paid members) and all. If email_segment is not specified, the default is all (no additional filtering applied).
Posts are sent by email if and only if an active newsletter is provided.
newsletter and email objects. If the related email object has a status of failed, sending can be retried by reverting the post’s status to draft and then republishing the post.

