SPF Record Testing ToolsYou use Sender Policy Framework (SPF) records to ensure that destination email systems trust messages sent from your domain. The SPF record is important because it ensures that all the messages from your domain appear to originate from the messaging servers that support the cloud-based service.
A good description of this is available on the Microsoft website at: http://technet.microsoft.com/en-us/library/dn789058(v=exchg.150).aspx
The testing tool itself is a great resource to validate the SPF record, once it is in place: |
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