I apologize my previous workaround isn't the solution you may have been looking for! I can understand how helpful it would be to control the to attribute in one of our emails. However as previously mentioned our campaigns do not work this way. Being able to do this is a great feature request I have submitted in your account to our Product Team. In the meantime, the only way this can be done is by manually sending it to them through one of the work around options provided.
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