Filter: gform_is_valid_notification_to

Allows overriding of the notification destination validation

Parameters

Name	Type	Description
$is_valid	`bool`	True if valid. False, otherwise.
$gform_notification_to_type	`string`	The type of destination.
$gform_notification_to_email	`string`	The destination email address, if available.
$gform_notification_to_field	`string`	The field that is being used for the notification, if available.