Cascade Directory forwarding Mail

Ok, this might be an easy one, but I cannot figure it out.

I have a “Customer Registration DB” that is being used to authenticate users to access our Web Site, when they register, they have to enter their e-mail address customer@theirdomain.com, so far so good, the problem is that if someone from the outside world addresses a message to the customer name @mydomain.com, our server recognize the user name on the Directory Assistance and then forwards the message to customer@theirdomain.com.

Is there a way to restrict SMTP inbound messages to only users in the names.nsf?

Thanks in advance.

RT

Subject: Cascade Directory forwarding Mail

Hi, for the record I got this response from IBM when I queries the same problem

Router/SMTP → Advanced → Controls

This only effects how the router does namelookups and not the clients.