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Update the content of a mailing

post https://127.0.0.1:8447/rest//transactionalmail//message/content

Update the content of a mailing. You can transmit plain text, html, or multipart content that consists of HTML and plain text. See Updating mailing content via REST API on Optimizely World. Note: You can only update the content of mailings created via REST API. This operation is also not suitable for confirmation mailings.

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