Domain name aliasing allows you to use more then one domain name for
the same domain. For example: If you have the domain MYDOMAIN.com and you
also want to use MYDOMAIN.net but have them go to the same place then you need
domain name aliasing.
As part of domain name aliasing we also offer mail aliasing. What that
does is makes the mail for MYDOMAIN.net to be sent to MYDOMAIN.com. Then all of
the user accounts and configurations are handled by the MYDOMAIN.com site.
There is no need to manage two sets of mail configurations.