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python-sparkpost generates a transmissions.send payload which is now considered invalid by the API, if you try to use both `cc` (or `bcc`) and the `recipients` dict structure required for merge_data. [Anymail had been generating that recipients dict structure in all cases, for simplicity. Sometime between 2016-06-07 and 2016-06-22, SparkPost began rejecting that if it appeared in the `header_to` constructed by python-sparkpost.]