post
https://{youraccountname}.api-us1.com/api/3/messages
html and text accept a fetch:https://example.com/content value, which loads the content from that URL; htmlfetch and textfetch control when it is fetched. The URL must be http/https and reachable, and a URL that is malformed or not allowed is rejected with a 422, as is an unsupported format, priority, charset or encoding.
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