gravity-forms-tracking.php

<?php

/*
 *
 * Save email in a cookie for ActiveCampaign
 *
 */
add_filter( 'gform_save_field_value', 'tlc_save_field_value', 10, 4);
function tlc_save_field_value( $value, $lead, $field, $form ) {
	if ($field['label'] == 'Your Email') { // MAKE SURE THIS MATCHES THE NAME OF YOUR FIELD LABEL IN YOUR FORM
		setcookie( 'email', htmlspecialchars($value, ENT_QUOTES), time() + 99999999, '/', NULL );
	}
	return $value;
}

?>