Alternately between the 2 emails, one at a time.

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Hello.
I have the following problem:
I need to get the information from a contact form in 2 different emails. But this receipt must be for 1 email at a time. Explain: A client fills out the form and the information goes to the email number 1. The information of the next fill of this form will go to the email 2. Alternately between the 2 emails, one at a time.
Thank you.