Filling the G-Apps: Domains
In Google Apps for Business Gmail you have 2 options for applying domains but they have their own restrictions. Add-on Domain Will give you the ability to add any email address from an applied domain to a user but we need to manually add each email address to each user. It also means that Google Apps can be accessed using these domains as well i.e. https://mail.google.com/a/companydomain.com. The only drawback is that you need to manually add the domain as you add each User or Group. Alias Domain Automatically adds the email address to every user & group in the organisation but you can't use the domain for any address other than the user name i.e. useralias@companydomain.com rather than user@companydomain.com or request@companydomain.com.