Dynamically "send to email" notification

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I’d look for a way to save the supplier email as a meta field on their specific page. You could then use the gform_notification filter to set the to email. Something like the following should work once you have a way to save the meta as supplier_email.

<?php

add_filter( 'gform_notification', function( $notification, $form, $entry ) {

   $notification['to'] = get_post_meta( get_the_ID(), 'supplier_email' );

   return $notification;

}, 10, 3 );