[cobalt-users] Virtual Domain

[Glida Coca Sujo <gsujo@xxxxxxxxxxxxxxx>]

We have a domain called www.pdomain.com.ni and we created a vitual domain
called www.xyz.com.ni inside this domain.  

When we create users for the domain www.xyz.com.ni, this users send e-mails
with the following address:  user01@xxxxxxxxxx, but the people that
received this mail read the following address: user01@xxxxxxxxxxxxxx

Our users have the following configuration in their pop3 mail client:
Incoming mail: xyz.com.ni
Outgoing mail: xyz.com.ni

We want that the people that received our clients mails can read the e-mail
addres as:  user01@xxxxxxxxxx  instead of   user01@xxxxxxxxxxxxxx

How we can do??