How to manipulate a php file for an email form?

I combined a php record which corresponds with an email form. we have already combined all as well as it works. My subject is how to have dual receivers of a email as well as have a single of them be hidden. When a a single chairman receives a email it shows which it was sent to dual people. How do we get it where it usually shows which it was sent to a single chairman though in being it was sent to dual people.

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