Get Google Applications for your domain

Goolge provides many services like Gmail, Google Talk, Google Calendar, Google Docs, Google Sites
for a domain free of cost.

Here is the link, by this you can get the google mail, docs and other
services for your domain.

http://www.google.com/a/help/intl/en/admins/editions_spe.html

Select "Standard Edition" Free and follow the instructions.

At the last step it will create one text file which you have to copy in
html/htdocs/public_html folder of your domain.
Goolge will read this file and verify the domain.