How To Create a SPF Record For Your Domain with Google Apps | DigitalOcean
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What Is an SPF Record? A Complete Guide
Adding an SPF record to the configuration of your domain name | OVH Guides
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Create a SPF record on GoDaddy - mail-tester.com
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Create an SPF TXT record -
Adding an SPF record to the configuration of your domain name | OVH Guides
