Different internet domains on one Lotus domain

Hello

I would like to include two different internet domains @xx.com and @zz.com on my Lotus Domain. I have seen many questions about this, but I have always seen that these domains are treated as aliases (with a Global Document ), but I don’t want this behaviour. I need that @xx.com and @yy.com are different and isolated domains, so if I send a mail to test@xx.com it is impossible that it will arrive to test@yy.com.

Is it possible? Have you any idea?

Thanks in advance

Marian