We have an exchange 2003 server, configured to accept messages from multiple smtp domain names. The domain are defined in the Recipient Policy folder in ESM. so far so good. We have a number of users with a smtp email domain address which is not defined in the Recipient policy domain list, these users are receiving email without any issues.
My question is I understood that in order to receive a message to specific smtp domain, it must be defined in the RUS list. Why is this server accepting messages for domains not listed in the Recipient Policy folder?