To access Mail admin interface, goto:
http://www.google.com/a/domainname.com
You can login with your Admin login and password
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To check your emails online, goto:
http://mail.google.com/a/domainname.com
Enter your email username and password, that will take you to the Mail Interface.
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For more details please visit http://support.google.com/a/?hl=en
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