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What is SPF?
Create a SPF record on DirectAdmin - mail-tester.com
Consolidating several SPF records into one - Domains - Namecheap.com
What is an SPF (Sender Policy Framework) Record?
How to Create a Single SPF Record from Multiple DNS Records (i.e. MailChimp & Office365) - YouTube
Configure SPF Record for your Domain - ServerSelf
