currently:
mail to recipients @[login to view URL] is delivered to the [login to view URL]
needed setting:
user1@[login to view URL] -> to be delivered to user1@[login to view URL] (original mailhost)
user2@[login to view URL] -> to be delivered to user2@[login to view URL]
user3@[login to view URL] -> to be delivered to user3@[login to view URL]
user4@[login to view URL] -> to be delivered to user4@[login to view URL] (original mailhost)