I have registered form Google Apps Preimer and I’m going to be using it for easy off location access to emails for my 3 domains (pixelpress.com.au lugg.com.au and digitalcoffee.com.au).

The most troublesome thing about setting this up was configuring Gmasil to allow me to send or reply to email from any of my domains.

This is how I set it up:

Important note: With Google Apps you will have to select one of your domains to be your primary domain.

Step 01:
Go to your Google Apps Dashboard and add your additional domains as aliases by going to ‘Domain Settings > Domain Names’.
Make you you go through the process of verifying the domains you add.

Step 02:
Go to your Gmail account and then ‘Settings > Accounts’ (‘Settings’ is usually found in the top right hand corner of the page).
Under the ‘Send Mail As’ option you can click on the ‘Add another email address you own’ link and add all the email addresses you want to send email from.

Step 03:
Also under the ‘Send Mail As’ option check the box for ‘Reply from the same address the message was sent to‘.

It should be set up now!

The information about setting up the custom from addresses was taken from this page: http://mail.google.com/support/bin/answer.py?answer=22370