[Optional] Set up single sign-on
If your environment uses a web-based SSO system and you want to integrate your security and authentication systems with Google Apps, you can use our SAML-based SSO service. This service integrates Google Apps login with your existing authentication system, such as a Lightweight Directory Access Protocol (LDAP) server (Microsoft Active Directory and others). Read more about single sign on.
You can learn more about MX records at http://www.google.com/support/a/bin/answer.py?answer=33.

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