How to prevent users with different domain receives mail?

If I send a message to psolano@domain2.com is delivered to psolano users eventhough the internet address for psolano is psolano@domain1.com and psolano@domain2.com doesn’t exist in the domino directory

Does exist a parameter to change to prevent this?

Subject: How to prevent users with different domain receives mail?

http://www-10.lotus.com/ldd/46dom.nsf/search?SearchView&Query="fullname%20only"%20AND%20FIELD%20from%20CONTAINS%20bruce%20stapley&SearchOrder=1&SearchMax=0&SearchWV=FALSE&SearchFuzzy=FALSE&Start=1&Count=100