Get all mail addresses from a domain

From: Eva Perales Laguna (eperales_at_ac.upc.es)
Date: 10/29/04 

Date: Fri, 29 Oct 2004 12:29:00 +0200
To: beginners@perl.org

Hello,

I use the Net::SMTP module to check if a mail address is present
in a domain. I do something like this:

   my $smtp = new Net::SMTP($domain);
        my $matches = $smtp->verify($usermane);

But I would like to get all the addresses in that domain.
Someone can help me?

Thanks!
Eva