From Email field | WordPress.org

Hello there,

If you have configured and email sending service in Fluent SMTP, all of the WordPress’s emails will be sent from the From Email you have configured. If you would like to use a custom From Email, you need to make sure that there is a connection exists in Fluent SMTP with that email.

As you are looking for a dynamic From Email, I am afraid this is not possible.

Thank you

 

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