Render a campaign message and return the generated email. This is the v3 equivalent of the source and structured actions of the v1 campaign_send action.

With structured=0 (the default) the rendered message is returned as one raw MIME string in result. With structured=1 the message is parsed and its headers, parts and attachments are returned as separate members alongside the raw source.

Rendering personalizes the message for email; the default address [email protected] renders the message without a contact. No email is delivered by this endpoint.

The account must have the Campaigns module enabled, otherwise the request answers 403.