Suggestions from google
http://mail.google.com/support/bin/answer.py?hl=en&ctx=mail&answer=1311182
# SPF record: An SPF record is a list of IP addresses that are authorized to send mail for a particular domain. For more information on how to publish an SPF record, please visit http://www.openspf.org.
DKIM: DKIM (DomainKeys Identified Mail) is a way to digitally sign messages and verify that the messages were sent by a particular domain. It works like a wax seal on an envelope, preventing messages from being tampered with.
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