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What is SPF ?

SPF (Sender Policy Framework) is a way to prevent sender address forgery in emails. SPF will not directly stop SPAM (junk email). It will give domain owners a way to define which mail sources are legitimate for their domain and which ones are not.

To enable SPF for your domain, go to the Email Options > SPF Protection section of your Web Hosting Control Panel.
Choose the exact domain name you wish to protect and switch the Status to ON from the drop-down menu next to your domain name.