Verify that local recipient exists in the local domain directory

HCL Domino Domino Forum
1

I want to enable this feature. But when I enable this, there is a drawback, as the redbook about spam says: Spammers are able to obtain valid email-addresses for users on our Domino Server.Has anyone experience with this drawback?

The redbook:

http://publib-b.boulder.ibm.com/Redbooks.nsf/9445fa5b416f6e32852569ae006bb65f/5f62fa338fe4dbc285256ca0006373d9?OpenDocument&Highlight=0,spam