I'm using RedHat 6.1, how can i configure few sub domain for my e-mail. There will be users in each of this sub domain. When the external user send mail to them it will send to firstname.lastname@example.org or email@example.com The particular are as followed.
Domain name - abc.com.au
Sub domain - group1.abc.com.au
How can i pull all this configuration into one single Linux server. Do i need to use Virtual Email Domain to get it works.